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@ 2013-05-21T16:05:08Z

<?php
$tests = array(
    "42",
    1337,
    0x539,
    02471,
    0b10100111001,
    1337e0,
    "not numeric",
    array(),
    9.1
);

foreach ($tests as $element) {
    if (is_numeric($element)) {
        echo "'{$element}' is numeric:", var_dump((float) $element), PHP_EOL;
    } else {
        echo "'{$element}' is NOT numeric", PHP_EOL;
    }
}

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
is_numeric: documentation ( source)

preferences:dark modelive preview

34.82 ms | 402 KiB | 5 Q