Test if a var is INT or "INT STRING"

<?php

    $tests = array(
        '1', 1, '1.4', 1.4, 'a', '1e4', array()
    );

    foreach($tests as $test) {
        var_dump(
            $test,
            (bool)preg_match('#^[0-9]+$#', $test),
            is_numeric($test) && $test == (int)$test
            );
        echo "\r\n";
    }

    $start  =   microtime();
    for($i=0; $i < 100;$i++) {
        foreach($tests as $test) {
            is_numeric($test) && $test == (int)$test;
        }
    }
    echo microtime() - $start."\r\n";

    $start  =   microtime();
    for($i=0; $i < 100;$i++) {
        foreach($tests as $test) {
            preg_match('#^[0-9]+$#', $test);
        }
    }
    echo microtime() - $start."\r\n";

    /*
        string(1) "1"
        bool(true)
        bool(true)

        int(1)
        bool(true)
        bool(true)

        string(3) "1.4"
        bool(false)
        bool(false)

        float(1.4)
        bool(false)
        bool(false)

        string(1) "a"
        bool(false)
        bool(false)

        string(3) "1e4"
        bool(false)
        bool(false)

        array(0) {
        }
        bool(false)
        bool(false)

        0.00048
        0.053274
    */

?>