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@ 2013-08-02T13:22:50Z

<?php
function runTest($v) {
    echo "Test case for "; var_dump($v);
    var_dump(is_numeric($v));
    echo "\n\n";
}
runTest('3');
runTest(3);
runTest('1');
runTest(1);
runTest('0');
runTest(0);
runTest('-1');
runTest(-1);
runTest(null);
runTest('');
runTest(false);

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

64.58 ms | 402 KiB | 5 Q