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Find if a string exists within a string
This function checks to see if a string exists within a string.
It will return TRUE or FALSE depending on the result.
Example
<?php
// Find if a string contains a URL
echo instr("This is content visit http://localhost for more", "http://", false);
// Returns TRUE
?>
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<?php
/**
* This function sees if a string exists within a string
*
* @access private
* @return boolean TRUE if found, FALSE if not found
* @param string $string Haystack
* @param string $find needle
* @param boolean $case_sensitive TRUE if searching casse sensitively, FALSE for otherwise
*/
function instr($string, $find, $case_sensitive = false)
{
$i = 0;
// Loop through each character within the string
while (strlen($string) >= $i)
{
unset($substring);
if ($case_sensitive)
{
$find= strtolower($find);
$string = strtolower($string);
}
$substring = substr($string, $i, strlen($find));
// Found the needle
if ($substring == $find)
{
return true;
}
// Next
$i++;
}
return false;
}
?>
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Developer Comments
Haig Evans-Kavaldjian
Why not just use (boolean) strpos() instead. This should be MUCH faster than your instr() function.
Ian
It would be nice if you could supply an array as the needle for multiple words.
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