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In this article, the editor introduces in detail "php how to display only letters and numbers". The content is detailed, the steps are clear, and the details are handled properly. I hope this "php how to show only letters and numbers" article can help you solve your doubts.

Php can filter strings, displaying only letters and numbers. Implementation method: 1, use "preg_match_all (" / [a-zA-Z0-9] / u "," $str ", $arr)" to find letters and numbers and store them in the array; 2, use "join ('', $arr [0])" to convert the array into a string.

Operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

Php can filter strings, displaying only letters and numbers.

In PHP, you can use the preg_match_all () function with regular expressions to filter strings, leaving only letters and numbers.

The regular expression used is: / [a-zA-Z0-9] / u

The preg_match_all () function takes a third argument of an array type, which is used to store all matching results.

The array is a two-dimensional array, and the resulting value can be concatenated into a string using the join () function.

Join ('', $arr [0])

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