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is_scalar -- Check whether a variable is a scalar
Scalar variables refer to those variables that contain integer, float, string or boolean, while array, object and resource are not scalars.
<?php function show_var($var) { if (is_scalar($var)) { echo $var; } else { var_dump($var); } } $pi = 3.1416; $proteins = array("hemoglobin", "cytochrome c oxidase", "ferredoxin"); show_var($pi); // 打印:3.1416 show_var($proteins) // 打印: // array(3) { // [0]=> // string(10) "hemoglobin" // [1]=> // string(20) "cytochrome c oxidase" // [2]=> // string(10) "ferredoxin" // } ?>
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