How to judge whether php is a number

In PHP, you can use the "is_numeric()" function to determine whether the parameter is a number. If so, it will return true. If not, it will return false. Its syntax is such as "is_numeric('abcd123') or die(' The supplied argument is not a number ');".

php determines whether it is a number

There are two methods

First First: Use a function directly, is_numeric(). This function is to detect whether the parameter is a number. If so, it returns true. If not, it returns false. For example:

<?php
 is_numeric( &#39;abcd123&#39; ) or die(&#39;提供的参数不是数字&#39;);

Second: Use regular expression matching. If the match is successful, it is a number, and true is returned. If the match is unsuccessful, it is not a number, and false is returned.

For example:

<?php
 preg_match(&#39;/^\d+$/i&#39;, &#39;abcd123&#39;) or die(&#39;提供的数据不是数字&#39;);

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