Home > Article > Backend Development > How to use is_numeric() in PHP to determine whether a variable is a number or a numeric string
In the daily use of PHP
, we often need to determine whether a variable is a number or a string of numbers. PHP
provides us with a built-in Function is_numeric()
helps us determine whether a variable is a number or a numeric string more efficiently.
Syntax:
bool is_numeric ( mixed $var )
$var: Variables that need to be judged
Return value: TRUE is returned if $var is a number or numeric string, otherwise FALSE is returned.
Usage example:
<?php $var = array(666678,"a678","666678",null,+125689.66); foreach ($var as $key => $value) { if(is_numeric($value)){ print("参数是数字或数字字符串<br/>"); }else{ print("参数不是数字或数字字符串<br/>"); } } ?>
输出: 参数是数字或数字字符串 参数不是数字或数字字符串 参数是数字或数字字符串 参数不是数字或数字字符串 参数是数字或数字字符串
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