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@ 2017-01-30T00:00:46Z

<?php

foreach ([NULL, '', 0, '0'] as $val) {
    echo var_export(is_numeric($val), TRUE) . PHP_EOL;
}

Output
Performance
VLD
References
Branches

is_numeric: documentation ( source)
var_export: documentation ( source)

preferences:dark modelive previewkey bindings

24.73 ms | 405 KiB | 5 Q