<?php
//error_reporting( 0 );

class string
{
	function lenght( $string )
	{
		if (!$string) { exit ( "INVALID string::lenght use, first arg missing/invalid" ); }
		return strlen( $string );
	}

	function find( $where, $what )
	{
		if (!$where) { exit ( "INVALID string::find use, first arg missing/invalid" ); }
		if (!$what) { exit ( "INVALID string::find use, first arg missing/invalid" ); }

		$result = strstr( $where, $what, false );
		if ($result)
		{
			return true;
		}

		return false;
	}

	function explode( $what, $string )
	{
		if (!$what) { exit( "INVALID string::explode use, first argument missing/invalid" ); }
		if (!$string) { exit( "INVALID string::explode use, second argument missing/invalid" ); }

		return explode( $what, $string );
	}

	function lower( $string )
	{
		if (!$string) { exit ( "INVALID string::lower use, first arg missing/invalid" ); }
		return strtolower( $string );
	}

	function upper( $string )
	{
		if (!$string) { exit ( "INVALID string::upper use, first arg missing/invalid" ); }
		return strtoupper( $string );
	}

	function check( $string, $what, $pos1, $pos2 )
	{
		if (!$string) { exit ( "INVALID string::check use, first arg missing/invalid" ); }
		if (!$what) { exit ( "INVALID string::check use, second arg missing/invalid" ); }

		if ( substr( $string, intval($pos1), intval($pos2) ) == $what )
		{
			return true;
		}

		return false;
	}
}

echo string::check( "STEAM_0:0:254353523", "STEAM_", 0, 6);
?>