How php filters strings to get only numbers

This article will explain in detail how php filters strings to get only numbers. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.

Get method: 1. Use the for statement to loop through the string, use the is_numeric () function to extract the numeric characters in the body of the loop and use the ". =" operator to assemble a new string. 2. Using the rule, use the "preg_replace (" / [^ 0-9] / ",", $str) statement.

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

Method 1: using the is_numeric () function

Use the for loop to iterate over the string $str, and use the is_numeric () function to determine whether $str [$I] is a numeric character. The is_numeric () function can detect whether a variable is a number or a numeric string.

Use is_numeric ($str [$I]) in the body of the loop to determine whether the $str [$I] character is a numeric character; if so, take it out and use ". =" to concatenate a numeric substring.

Look at the output:

01234567890

Method 2: use the preg_replace () function

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