PHP substring extraction Get the string before the first or the whole string

Question

I am trying to extract a substring  I need some help with doing it in PHP   Here are some sample strings I am working with and the results I need    home cat1 subcat2   gt  home  test cat2   gt  test  startpage   gt  startpage   I want to get the string till the first    but if no   is present  get the whole string   I tried   substr  mystring  0  strpos  mystring          I think it says - get the position of   and then get the substring from position 0 to that position   I don t know how to handle the case where there is no    without making the statement too big   Is there a way to handle that case also without making the PHP statement too complex

User · Answer

What about this    substr  mystring      0  strpos  mystring          Simply add a     to the end of mystring so you can be sure there is at least one

User · Answer

You could create a helper function to take care of that          Return string before needle if it exists         param string  str     param mixed  needle     return string     function str before  str   needle         pos   strpos  str   needle        return   pos     false    substr  str  0   pos     str      Here s a use case    sing    My name is Luka  I live on the second floor     echo str before  sing           My name is Luka

User · Answer

One-line version of the accepted answer    out explode       mystring  2  0     Should work in php 5 4

User · Answer

first   explode       string  0

User · Answer

The most efficient solution is the strtok function  strtok  mystring        NOTE  In case of more than one character to split with the results may not meet your expectations e g  strtok  quot somethingtosplit quot    quot to quot   returns s because it is splitting by any single character from the second argument  in this case o is used    friek108 thanks for pointing that out in your comment  For example   mystring    home cat1 subcat2     first   strtok  mystring        echo  first     home  and  mystring    home    first   strtok  mystring        echo  first     home

User · Answer

string  kalion home public html     newstring   stristr  string       FALSE      string   substr  string 0 stripos  string

User · Answer

I think this should work   substr  mystring  0     pos    strpos  mystring           false      pos   strlen  mystring

User · Answer

Use explode     arr   explode       string  2    first    arr 0     In this case  I m using the limit parameter to explode so that php won t scan the string any more than what s needed

User · Answer

The function strstr   in PHP 5 3 should do this job   The third parameter however should be set to true    But if you re not using 5 3  then the function below should work accurately   function strbstr   str   char   start 0        if   isset  str   start     amp  amp   str  start    char            return  str  start  strbstr   str   char   start 1              I haven t tested it though  but this should work just fine   And it s pretty fast as well

User · Answer

Late is better than never  php has a predefined function for that  here is that good way   strstr   if you want to get the part before match just set before needle  3rd parameter  to true http   php net manual en function strstr php  function not strtok  string   delimiter             buffer   strstr  string   delimiter  true        if  false      buffer            return  string             return  buffer     var dump      not strtok  st art page

User · Answer

Using current on explode would ease the process     str   current explode       str  2

User · Answer

why not use   function getwhatiwant  s         delimiter           x strstr  s  delimiter true       return   x  x  s       OR      function getwhatiwant  s               delimiter              t explode  delimiter   s          return   t 1   t 0   s

User · Answer

This is probably the shortest example that came to my mind   list  first    explode       mystring     1  list   will automatically assign string until     if delimiter is found  2  if delimiter    is not found then the whole string will be assigned     and if you get really obsessed with performance  you may add extra parameter to explode explode       mystring  2  which limits maximum of the returned elements

User · Answer

You can also use this one line solution  list  substring    explode       string

User · Answer

You can try using a regex like this    s   preg replace                s     sometimes  regex are slower though  so if performance is an issue  make sure to benchmark this properly and use an other alternative with substrings if it s more suitable for you

[php] PHP substring extraction. Get the string before the first '/' or the whole string

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