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How to effectively use variables within strings to insert bits of data where needed.
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A tutorial on using complex curly syntax to access arrays and objects in strings.
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Validating user-input is one of the most important ways to increase security and prevent hacks; in this article, I will show how to easily validate GET and POST parameters, and prevent your app from being abused to send spam.
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How to check if a string begins with another string.
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How to count the number of characters in a multi-byte string using PHP.
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Backslash needs to be tediously excaped in PHP, both when uccuring inside your PHP script, and when used with preg_replace.
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Tutorial on how to replace parts of a string with str_replace and regular expressions.
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Check if a string contains a substring using strpos and regular expressions.
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This shows how to do a grep-like action using regular expressions from a PHP script.
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How to break down strings into smaller parts using PHP.