find in php string or

<?php
$mystring = 'abc';
$findme   = 'a';
$pos = strpos($mystring, $findme);

// Note our use of ===.  Simply == would not work as expected
// because the position of 'a' was the 0th (first) character.
if ($pos === false) {
    echo "The string '$findme' was not found in the string '$mystring'";
} else {
    echo "The string '$findme' was found in the string '$mystring'";
    echo " and exists at position $pos";
}
?>

//Find the position of the first occurrence of a substring in a string
$mystring = 'abc';
$findme   = 'a';
$pos = strpos($mystring, $findme);

$a = 'How are you?';

if (strpos($a, 'are') !== false) {
    echo 'true';
}

<?php
// We can search for the character, ignoring anything before the offset
$newstring = 'abcdef abcdef';
$pos = strpos($newstring, 'a', 1); // $pos = 7, not 0
?>

<?php
function g($string,$start,$end){
     preg_match_all('/' . preg_quote($start, '/') . '(.*?)'. preg_quote($end, '/').'/i', $string, $m);
     $out = array();

     foreach($m[1] as $key => $value){
       $type = explode('::',$value);
       if(sizeof($type)>1){
          if(!is_array($out[$type[0]]))
             $out[$type[0]] = array();
          $out[$type[0]][] = $type[1];
       } else {
          $out[] = $value;
       }
     }
  return $out;
}
print_r(g('Sample text, [/text to extract/] Rest of sample text [/WEB::http://google.com/] bla bla bla. ','[/','/]'));
?>

results:
Array
(
    [0] => text to extract
    [WEB] => Array
        (
            [0] => http://google.com
        )

)

Can be helpfull to custom parsing :)