- is_numeric: documentation ( source)
<?php
$tests = array(
"42",
1337,
0x539,
'0x539',
"0x539",
02471,
'02471',
"02471",
0b10100111001,
'0b10100111001',
"0b10100111001",
);
foreach ($tests as $element) {
if (is_numeric($element)) {
echo "'{$element}' is considered numeric", PHP_EOL;
} else {
echo "'{$element}' is not considered numeric", PHP_EOL;
}
}