What does mean in PHP

Question

lt  php   a 1     gt   lt    a   gt    What does  lt    mean exactly

User · Answer

lt    a    gt    is a shortcut for    lt  php echo  a    gt

User · Answer

It s a shorthand for  lt  php echo  a    gt    It s enabled by default since 5 4 regardless of php ini settings

User · Answer

lt     a   gt  is the same as  lt   echo  a    gt   just shorthand for convenience

User · Answer

gt  is the separator for associative arrays  In the context of that foreach loop  it assigns the key of the array to  user and the value to  pass   Example    user list   array       dave    gt   apassword        steve    gt   secr3t      foreach   user list as  user   gt   pass        echo    user  s pass is    pass  n        Prints       dave s pass is  apassword      steve s pass is  secr3t    Note that this can be used for numerically indexed arrays too   Example    foo   array  car    truck    van    bike    rickshaw    foreach   foo as  i   gt   type        echo    i     type  n        prints     0  car    1  truck    2  van    3  bike    4  rickshaw

User · Answer

I hope it doesn t get deprecated  While writing  lt   blah code   gt  is fairly unnecessary and confusable with XHTML   lt    isn t  for obvious reasons  Unfortunately I don t use it  because short open tag seems to be disabled more and more   Update  I do use  lt    again now  because it is enabled by default with PHP 5 4 0  See http   php net manual en language basic-syntax phptags php

User · Answer

It s a shorthand for this    lt  php echo  a    gt    They re called short tags  see example  2 in the documentation

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Since it wouldn t add any value to repeat that it means echo  I thought you d like to see what means in PHP exactly   Array        0    gt  Array                        0    gt  368    T OPEN TAG WITH ECHO              1    gt   lt                 2    gt  1                1    gt  Array                        0    gt  309    T VARIABLE              1    gt   a              2    gt  1                2    gt       UNKNOWN  because it is optional  ignored        3    gt  Array                        0    gt  369    T CLOSE TAG              1    gt    gt               2    gt  1               You can use this code to test it yourself    tokens   token get all   lt    a   gt     print r  tokens   foreach  tokens as  token       echo token name  int   token 0    PHP EOL      From the List of Parser Tokens  here is what T OPEN TAG WITH ECHO links to

User · Answer

As of PHP 5 4 0        lt        gt  are always available even without the short open tag set in php ini   Furthermore  as of PHP 7 0  The ASP tags       lt      gt   and the script tag       lt script language  php  gt   are removed from PHP

User · Answer

It s a shortcut for  lt  php echo  a    gt  if short open tags are enabled  Ref  http   php net manual en ini core php

User · Answer

user list is an array of data which when looped through can be split into it s name and value   In this case it s name is  user and it s value is  pass

User · Answer

Code like  a    b  means  for an associative array  some languages  like Perl  if I remember correctly  call those  hash    that  a  is a key  and  b  a value   You might want to take a look at the documentations of  at least    foreach arrays   Here  you are having an array  called  user list  and you will iterate over it  getting  for each line  the key of the line in  user  and the corresponding value in  pass   For instance  this code    user list   array       user1    gt   password1        user2    gt   password2       foreach   user list as  user   gt   pass        var dump  user    user and password    pass        Will get you this output   string  user   user1 and password   password1   length 37  string  user   user2 and password   password2   length 37     I m using var dump to generate a nice output  that facilitates debuging  to get a normal output  you d use echo     Equal or greater  is the other way arround   greater or equals   which is written  in PHP  like this       The Same thing for most languages derived from C  C    JAVA  PHP        As a piece of advice  If you are just starting with PHP  you should definitely spend some time  maybe a couple of hours  maybe even half a day or even a whole day  going through some parts of the manual  -  It d help you much

User · Answer

An array in PHP is a map of keys to values    array   array     array  yellow     3   array  green     4    If you want to do something with each key-value-pair in your array  you can use the foreach control structure   foreach   array as  key   gt   value    The  array variable is the array you will be using  The  key and  value variables will contain a key-value-pair in every iteration of the foreach loop  In this example  they will first contain  yellow  and 3  then  green  and 4   You can use an alternative notation if you don t care about the keys   foreach   array as  value

User · Answer

It means assign the key to  user and the variable to  pass  When you assign an array  you do it like this   array   array  key    gt   value      It uses the same symbol for processing arrays in foreach statements  The      links the key and the value   According to the PHP Manual  the      created key value pairs   Also  Equal or Greater than is the opposite way        In PHP the greater or less than sign always goes first          lt      And just as a side note  excluding the second value does not work like you think it would  Instead of only giving you the key  It actually only gives you a value    array   array  test    gt   foo     foreach  array as  key   gt   value        echo  key            value     Echoes  test   foo     foreach  array as  value        echo  value     Echoes  foo

User · Answer

Arrays in PHP are associative arrays  otherwise known as dictionaries or hashes  by default  If you don t explicitly assign a key to a value  the interpreter will silently do that for you  So  the expression you ve got up there iterates through  user list  making the key available as  user and the value available as  pass as local variables in the body of the foreach

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