How php tests alphanumeric characters

This article will explain in detail how to test alphanumeric characters in php. The editor thinks it is very practical, so I share it with you for reference. I hope you can get something after reading this article.

Test alphanumeric characters

You have a string to test if it contains only alphanumeric characters.

Regular preg_match ('/ ^ [a-zA-Z0-9] + $/', $string); replace ctype_alnum ($string); performance

I created an array containing more than 100k alphanumeric and non-alphanumeric strings. This is the best result:

Method execution time processing time preg_match15.39 milliseconds ctype_alnum2.06 milliseconds

In this measurement, the alternative method is 7.5 times faster (86.59%). On average, the speed has increased by about 4 times (76%). You can apply the same content to ctype_alpha () (check alphabetic characters) and ctype_digit () (check numeric characters).

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