How can I write to the console in PHP

Question

Is it possible write a string or log into the console   What I mean  Just like in JSP  if we print something like system out println  some    it will be there at the console  not at a page

User · Answer

Clean  fast and simple without useless code  function consolelog  data        echo  quot  lt script gt console log   quot   data  quot     lt  script gt  quot

User · Answer

Short and easy  for arrays  strings or also objects   function console log   data        output      lt script gt console log   PHP debugger        output    json encode print r  data  true       output          lt  script gt      echo  output

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Or you use the trick from PHP Debug to console  First you need a little PHP helper function function debug to console  data         output    data      if  is array  output            output   implode       output        echo  quot  lt script gt console log  Debug Objects   quot     output    quot      lt  script gt  quot      Then you can use it like this  debug to console  quot Test quot     This will create an output like this  Debug Objects  Test

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Short and simply with printf and json encode  function console log  data        printf   lt script gt console log  s   lt  script gt    json encode  data

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For Chrome there is an extension called Chrome Logger allowing to log PHP messages   The Firefox DevTools even have integrated support for the Chrome Logger protocol   To enable the logging  you just need to save the  ChromePhp php  file in your project  Then it can be used like this   include  ChromePhp php   ChromePhp  log  Hello console     ChromePhp  log   SERVER   ChromePhp  warn  something went wrong       Example taken from the GitHub page   The output may then look like this

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By default  all output goes to stdout  which is the HTTP response or the console  depending on whether your script is run by Apache or manually on the command line  But you can use error log for logging and various I O streams can be written to with fwrite

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Try the following  It is working   echo   lt script gt console log  PHP       data        lt  script gt

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I was looking for a way to debug code in a WordPress plugin that I was developing and came across this post   I took the bits of code that are most applicable to me from other responses and combined these into a function that I can use for debugging WordPress  The function is   function debug log  object null   label null   priority 1         priority    priority lt 1  1   priority       message   json encode  object  JSON PRETTY PRINT        label    Debug      label       label                  echo   lt script gt console log      str repeat  -    priority-1     label            message       lt  script gt        Usage is as follows    txt    This is a test string    sample array   array  cat    dog    pig    ant    fly    debug log  txt      7   debug log  sample array     If this function is used with WordPress development  the function should be placed in the functions php file of the child theme and can then be called anywhere in the code

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There is also a great Google Chrome extension  PHP Console  with a PHP library that allows you to    See errors and exceptions in the Chrome JavaScript console and in the notification popups  Dump any type of variable  Execute PHP code remotely  Protect access by password  Group console logs by request  Jump to error file line in your text editor  Copy error debug data to the clipboard  for testers

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Use   function console log  data         bt   debug backtrace         caller   array shift  bt        if  is array  data            dataPart   implode       data       else          dataPart    data        toSplit    caller  file                             caller  line         gt       dataPart      error log end split       toSplit

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If you re looking for a simple approach  echo as JSON    lt script gt      console log  lt    json encode  foo     gt     lt  script gt

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function phpconsole  label  var    x          gt       lt script type  text javascript  gt          console log   lt  php echo   label   gt             console log   lt  php echo json encode  x   gt          lt  script gt       lt  php

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Some great answers that add more depth  but I needed something simpler and more like the JavaScript console log   command   I use PHP in a lot of  gathering data and turn into XML  in Ajax applications  The JavaScript console log doesn t work in that case  it breaks the XML output   Xdebug  etc  had similar issues   My solution in Windows    Setup a  txt file that is somewhat easily to get to and writable Set the PHP error log variable in the  ini file to write to that file Open the file in Windows File Explorer and open a preview pane for it Use the error log  myTest    PHP command to send messages   This solution is simple and meets my needs most of the time  Standard PHP  and the preview pane automatically updates every time PHP writes to it

User · Answer

Here s a handy function  It is super simple to use  allows you to pass as many arguments as you like  of any type  and will display the object contents in the browser console window as though you called console log from JavaScript - but from PHP  Note  you can use tags as well by passing  TAG-YourTag   and it will be applied until another tag is read  for example   TAG-YourNextTag          Brief          Print to console log   from PHP        Description    Print as many strings arrays  objects  and                    other data types to console log from PHP                        To use  just call consoleLog  data1   data2       dataN                     and each dataI will be sent to console log - note                    that you can pass as many data as you want an                    this will still work                        This is very powerful as it shows the entire                    contents of objects and arrays that can be                    read inside of the browser console log                        A tag can be set by passing a string that has the                    prefix TAG- as one of the arguments  Everytime a                    string with the TAG- prefix is detected  the tag                    is updated  This allows you to pass a tag that is                    applied to all data until it reaches another tag                     which can then be applied to all data after it                        Example                        consoleLog  TAG-FirstTag    data   data2   TAG-SecTag   data3                         Result                         FirstTag     data                            FirstTag     data2                            SecTag       data3         function consoleLog        if func num args      0           return              tag           for   i   0   i  lt  func num args     i               arg   func get arg  i           if  empty  arg                if is string  arg   amp  amp  strtolower substr  arg  0  4        tag-                     tag   substr  arg  4                else                   arg   json encode  arg  JSON HEX TAG   JSON HEX AMP                    echo   lt script gt console log       tag          arg        lt  script gt                                      NOTE  func num args   and func num args   are PHP functions for reading a dynamic number of input arguments  and allow this function to have infinitely many console log requests from one function call

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For Ajax calls or XML   JSON responses  where you don t want to mess with the body  you need to send logs via HTTP headers  then add them to the console with a web extension  This is how FirePHP  no longer available  and QuantumPHP  a fork of ChromePHP  do it in Firefox   If you have the patience  x-debug is a better option - you get deeper insight into PHP  with the ability to pause your script  see what is going on  then resume the script

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I might be late for a party  but I was looking for an implementation of logging function which    takes a variable number of comma separated arguments  just like javascript console log    gives a formatted output  not just a serialized string   is distinguishable from a common javascript console log      So the output looks like that      The snippet below is tested on php 7 2 11  I m not sure about its php backward compatibility  It can be an issue for javascript as well  in a term of old browsers   because it creates a trailing comma after console log   arguments     which is not legal until ES 2017     lt  php  function console log     args         args as json   array map function   item            return json encode  item           args         js code     lt script gt console log   c  log from PHP     background   474A8A  color   B0B3D6  line-height  2         foreach   args as json as  arg             js code       arg                js code       lt  script gt         echo  js code      list     foo    bar     obj   new stdClass     obj- gt first name    John    obj- gt last name    Johnson    echo console log  list   Hello World   123   obj      gt

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Though this is an old question  I ve been looking for this  Here s my compilation of some solutions answered here and some other ideas found elsewhere to get a one-size-fits-all solution  CODE          Post to browser console     function console  data   is error   false   file   false   ln   false            if  function exists  console wer                  function console wer  data   is error   false   bctr   file   ln                    echo   lt div display  quot none quot  gt     lt script type  quot text javascript quot  gt      is error   false     if typeof phperr to cns       undefined      var phperr to cns   1  document addEventListener  quot DOMContentLoaded quot   function     setTimeout function    alert  quot Alert  see console  quot       4000                   console group  quot PHP      is error     error     log     from  quot  window atob  quot   base64 encode    file   false     bctr  file      file     quot        ln   false  amp  amp   file   false      bctr   false       quot  on line      ln   false     bctr  line      ln      quot        quot    quot        console      is error     error     log         is array  data      JSON parse window atob  quot   base64 encode json encode  data     quot         quot    data   quot        console groupEnd    lt  script gt  lt  div gt    return true                                  return  console wer  data   is error     file   false  amp  amp   ln   false    array shift debug backtrace      false    file   ln                    PHP Exceptions handler     function exceptions to console  svr   str   file   ln            if  function exists  severity tag                  function severity tag  svr                     names                        consts   array flip array slice get defined constants true   Core    0  15  true                    foreach   consts as  code   gt   name                        if   svr  amp   code   names      name                                    return join         names                                   if  error reporting      0                return false                    if error reporting    amp   svr                console severity tag  svr         str  true   file   ln                           Divert php error traffic     error reporting E ALL         ini set  quot display errors quot    quot 1 quot        set error handler  exceptions to console     TESTS  amp  USAGE   Usage is simple  Include first function for posting to console manually  Use second function for diverting php exception handling  Following test should give an idea         Test 1 - Auto - Handle php error and report error with severity info      a 1     jfksjfks       try              b    a 0         catch  Exception  e              echo  quot jsdlkjflsjfkjl quot                 Test 2 - Manual - Without explicitly providing file name and line no            console array 1   gt   quot Hi quot   array  quot hellow quot     false               Test 3 - Manual - Explicitly providing file name and line no            console array 1   gt   quot Error quot   array  some result    true   my file   2               Test 4 - Manual - Explicitly providing file name only            console array 1   gt   quot Error quot   array  some result    true   my file          EXPLANATION    The function console  data   is error   file   fn  takes string or array as first argument and posts it on console using js inserts   Second argument is a flag to differentiate normal logs against errors  For errors  we re adding event listeners to inform us through alerts if any errors were thrown  also highlighting in console  This flag is defaulted to false   Third and fourth arguments are explicit declarations of file and line numbers  which is optional  If absent  they re defaulted to using the predefined php function debug backtrace   to fetch them for us   Next function exceptions to console  svr   str   file   ln  has four arguments in the order called by php default exception handler  Here  the first argument is severity  which we further crosscheck with predefined constants using function severity tag  code  to provide more info on error    NOTICE    Above code uses JS functions and methods that are not available in older browsers  For compatibility with older versions  it needs replacements   Above code is for testing environments  where you alone have access to the site  Do not use this in live  production  websites    SUGGESTIONS    First function console   threw some notices  so I ve wrapped them within another function and called it using error control operator      This can be avoided if you didn t mind the notices   Last but not least  alerts popping up can be annoying while coding  For this I m using this beep  found in solution   https   stackoverflow com a 23395136 6060602  instead of popup alerts  It s pretty cool and possibilities are endless  you can play your favorite tunes and make coding less stressful

User · Answer

echo    lt div display  none  gt       lt script type  text javascript  gt          console log  console log message         lt  script gt   lt  div gt      Creates a   lt div gt    with the   display  none    so that the div is not displayed  but the   console log     function is created in javascript  So you get the message in the console

User · Answer

As the author of the linked webpage in the popular answer  I would like to add my last version of this simple helper function  It is much more solid   I use json encode   to make a check for if the variable type is not necessary and also add a buffer to solve problems with frameworks  There not have a solid return or excessive usage of header            Simple helper to debug to the console        param  data object  array  string  data     param  context string  Optional a description         return string     function debug to console  data   context    Debug in Console             Buffering to solve problems frameworks  like header   in this and not a solid return      ob start          output     console info        context                 output     console log     json encode  data               output    sprintf   lt script gt  s lt  script gt     output        echo  output      Usage      data is the example variable  object  here an array   data      foo    gt   bar     debug to console  data      Screenshot of the result  Also a simple example as an image to understand it much easier

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I have abandoned all of the above in favour of Debugger  amp  Logger  I cannot praise it enough  Just click on one of the tabs at top right  or on the  quot click here quot  to expand hide  Notice the different  quot categories quot   You can click any array to expand collapse it  From the web page  Main features   Show globals variables   GLOBALS    POST    GET    COOKIE  etc   Show PHP version and loaded extensions Replace PHP built in error handler Log SQL queries Monitor code and SQL queries execution time Inspect variables for changes Function calls tracing Code coverage analysis to check which lines of script where executed Dump of all types of variable File inspector with code highlighter to view source code Send messages to JavaScript console  Chrome only   for Ajax scripts

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As of 2017  Firebug and hence FirePHP has been disabled   I wrote some little modifications to the ChromePHP tool to allow seamless migration from FirePHP to Firebug for debugging via the console   This article explains in clear easy steps  Migrate from FirePHP to ChromePHP in 5 minutes  without breaking existing code

User · Answer

Firefox  On Firefox you can use an extension called FirePHP which enables the logging and dumping of information from your PHP applications to the console  This is an addon to the awesome web development extension Firebug    http   www studytrails com blog using-firephp-in-firefox-to-debug-php    Chrome  However if you are using Chrome there is a PHP debugging tool called Chrome Logger or webug  webug has problems with the order of logs    More recently Clockwork is in active development which extends the Developer Tools by adding a new panel to provide useful debugging and profiling information  It provides out of the box support for Laravel 4 and Slim 2 and support can be added via its extensible API    Using Xdebug  A better way to debug your PHP would be via Xdebug  Most browsers provide helper extensions to help you pass the required cookie query string to initialize the debugging process     Chrome - Xdebug Helper Firefox - The easiest Xdebug Opera - Xdebug Safari - Xdebug Toggler

User · Answer

Any of these two are working    lt  php      five   5       six   6    gt   lt script gt      console log  lt  php echo  five    six   gt     lt  script gt     lt  php      five   5       six   6      echo   lt script gt console log  five    six   lt  script gt       gt

User · Answer

variable    Variable   echo   lt script gt console log   variable    lt  script gt      PHP and JavaScript interaction

User · Answer

Here is my solution  the good thing about this one is that you can pass as many params as you like   function console log          js code    console log     json encode func get args    JSON HEX TAG                       js code     lt script gt      js code     lt  script gt        echo  js code      Call it this way  console log  DEBUG gt  gt     Param 1    Param 2    console log  Console DEBUG     someRealVar1   someVar   someArray   someObj     Now you should be able to see output in your console  happy coding

User · Answer

I find this helpful   function console  data   priority   debug        if   priority  lt    debug                 output     lt script gt console log      str repeat       priority-1     is array  data    implode       data     data         lt  script gt             echo  output            And use it like    lt  php      debug   5     All lower and equal priority logs will be displayed     console  Important   1    debug       console  Less Important   2    debug       console  Even Less Important   5    debug       console  Again Important   1    debug     gt    Which outputs in console    Important  Less Important      Even Less Important Again Important    And you can switch off less important logs by limiting them using the  debug value

User · Answer

I think it can be used --  function jsLogs  data         html            coll       if  is array  data     is object  data              coll   json encode  data         else            coll    data              html     lt script gt console log  PHP    coll     lt  script gt         echo  html         exit         For String jsLogs  testing string     PHP  testing string    For Array jsLogs array  test1    test2       PHP    test1   test2      For Object jsLogs array  test1   gt array  subtest1    subtest2       PHP    test1    subtest1   subtest2

User · Answer

If you want write to the PHP log file  and not the JavaScript console you can use this    error log  This is logged only to the PHP log    Reference  error log

[php] How can I write to the console in PHP?

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