How to replace specific string with null value in PHP

PHP method to replace a specific string with a null value: 1. Use substring replacement [$id = str_replace(".html", "", $id)]; 2. Regular expression Substring replacement [$id = preg_replace("/\.html/", "", $id)].

PHP method to replace a specific string with a null value:

Substring replacement:

$id = str_replace(".html", "", $id);

Or regular expression substring replacement:

$id = preg_replace("/\.html/", "", $id);

In fact, if you are sure that the string format you want to process is "string-number.html", where string consists of non-"-" and " .", then the following statement will be OK:

$array = preg_split('/[-\.]/', $querystring, -1, PREG_SPLIT_NO_EMPTY);

$array[1] is the data you want.

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