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PHP is_numeric() 函数
tryphp_func_var_is_numeric
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<!DOCTYPE html> <html> <body> <?php $a = 32; echo "a is " . is_numeric($a) . "<br>"; $b = 0; echo "b is " . is_numeric($b) . "<br>"; $c = 32.5; echo "c is " . is_numeric($c) . "<br>"; $d = "32"; echo "d is " . is_numeric($d) . "<br>"; $e = true; echo "e is " . is_numeric($e) . "<br>"; $f = null; echo "f is " . is_numeric($f) . "<br>"; ?> </body> </html>