[RESOLVED] Returning all positons of character in a string

[my_name]

Let's say I had the following declaration:

$string = "encyclopedia";

And let's say that I wanted to return the positions of all "C" characters within the string variable. In this instance, I would want it to return 2 and 4, since those are the positions of the "C" character within the string.

I saw some functions on the official PHP site, but they only seem to return the first position of a character.

[suomynonA]

Here's one way to do it:

<?php

$pos=-1;
while(($pos=strpos($string,'c',$pos+1))!==FALSE)
	{
		echo("Position: ".$pos."<br />");
	}

?>

You can add a counter as well to count each occurence, you can write it as a recursive function, whatever you like.

EDIT: Note the use of the "!==" (not identical) operator. You'll get the same results if you use "!=" instead, but I preffered to stick to the manual recommendations as you might never know what strings will you use:

This function may return Boolean FALSE, but may also return a non-Boolean value which evaluates to FALSE, such as 0 or "". Please read the section on Booleans for more information. Use the === operator for testing the return value of this function.

[Weedpacket]

Another is to use [man]preg_match_all[/man] with the offset-capture flag.