Why does php display only letters and numbers?

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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