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