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PHP : Function Reference : String Functions : strcspn

strcspn

Find length of initial segment not matching mask (PHP 4, PHP 5)
int strcspn ( string str1, string str2 [, int start [, int length]] )


Related Examples ( Source code ) » strcspn



Code Examples / Notes » strcspn

maskedcoder

useful for finding beginning of quotes and/or tags in a variable containing html.  
   $pos = strcspn($data, '<"\'');
will find the first occurance of either the beginning of a tag, or a double- or single-quoted string.


at-he at_he

this function can be used like strspn(), except while that can be used to compare a string with an allowed pattern, this one can be use to compare a string with a FORBIDDEN pattern
so, to know if any forbidden character has a position inside our string, we can use (not tested with backslashes)...
<?php
// LARGE VERSION
$forbidden="\"\\?*:/@|<>";
if (strlen($filename) != strcspn($filename,$forbidden)) {
   echo "you cant create a file with that name!";
}
// SHORT VERSION
if (strlen($filename) - strcspn($filename,"\"\\?*:/@|<>")) {
   echo "i told you, you cant create that file";
}
?>


php

Also useful for breaking down expressions - for example parsing SQL: values ('this', fn("that,)()", 4))
$sep = strcspn ($list, "'\"`"); // Start of quoted string
$list = substr ($list, $sep);
$find = substr ($list, 0, 1);
while (($sep = strpos ($list, $find, $sep+1)) > 0 && substr ($list, $sep-1, 1) == '\\')
{}
//  $sep now spans the entire string, regardless of embedded quotes
Once the strings have been removed, an expression can then be parsed for commas and brackets without worrying about them:
while ($out != '')
{
$sep = strcspn ($list, "(),");  //  Next seperator
...
}


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