How PHP uses preg_replace ()

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Preg_replace ()

Function prototype: mixed preg_replace (mixed $pattern, mixed $replacement, mixed $subject [, int $limit])

Preg_replace is more powerful than ereg_replace. Arrays can be used for the first three parameters; the fourth parameter, $limit, sets the number of replacements, which defaults to all substitutions. Code 6.7 is an application example of array substitution.

Code 6.7 Array replacement

The code is as follows:

The output is as follows.

Name: Thomas Ching ", Email: tom@emailaddress.com Address: No.5, Wilson St., New York, U.S.A

The pattern modifier "e" can be used in preg_replace 's regular expressions. Its purpose is to use the matching result as an expression and can be recalculated. For example:

The code is as follows: