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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).

This is the end of the article on "how to test alphanumeric characters in php". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, please share it for more people to see.

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