note 102276 deleted from control-structures.switch by danbrown

Note Submitter: jekyl1982 

----

Problem with (int)0 in switch statement

<?php

// param
$param = 1;

// should be bool(true)
var_dump(preg_match('/[0-9]/', $param) === 1);

echo "<BR>";

// should be bool(false)
var_dump(preg_match('/[0-9]/', $param) === 0);

echo "<BR>";

// should be bool(false)
var_dump(preg_match('/[a-z]/', $param) === 1);

echo "<BR>";

// now some kind of black magic
// for $param = 0 it will print STRING but for $param = 1 it will print INT
switch ($param) {
    case (preg_match('/[0-9]/', $param) === 1):
        echo 'INT';
        break;
    case (preg_match('/[a-z]/', $param) === 1):
        echo 'STRING';
        break;
    default:
        echo 'nothing';
}

// good match, in switch put (bool)TRUE
switch (TRUE) {
    case (preg_match('/[0-9]/', $param) === 1):
        echo 'INT';
        break;
    case (preg_match('/[a-z]/', $param) === 1):
        echo 'STRING';
        break;
    default:
        echo 'nothing';
}

// now it will print INT 
// isn't it strange have fun with PHP ;)

?>