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PHP

Validating a Date

Learn how to validate a date with the help of checkdate() function.

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PHP

Formatting Date and Time

In this tutorial, we’ll discuss the date(), gmdate() and idate() functions. We’ll use these functions to convert a timestamp to readable date and time format, to change the format of a date or time, and to format the current date and time.

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PHP

Generating a Timestamp

The tutorial teaches you various techniques to generate a Unix timestamp for the current or a specific DateTime by using time(), microtime(), mktime(), gmmktime() and strtotime() functions.

Categories
PHP

Data Validation with Regular Expressions

In this tutorial, you’ll see how regular expressions work, we use some of the data validation tasks to demonstrate how we can use regular expressions to validate usernames, phone numbers, and postal codes.

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PHP

Word Boundaries in Regular Expression

How to mark word boundaries to “match a specific word only” using a regular expression.

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PHP

Handling Errors in Regular Expressions

The regular expression functions in PHP do not throw exceptions, so if there is an error in the regular expression, what will you do? To handle regular expressions errors, PHP offers two functions : preg_last_error() and preg_last_error_msg().

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PHP

Escaping special characters in regular expressions

The :.\+*?[^]$(){}=!<>|:-# letters are special characters that make regular expressions work. If you want to match one of these characters you need to write a backslash in front of that character in the pattern. For example, if you want to match a “+” character, you write “\+” in the pattern. You can escape special characters manually by placing a backslash in front of each character you want to match, or you can the use preg_quote() function to escape special characters automatically. In this tutorial, you’ll also learn a technique that helps you to avoid escaping special characters.

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PHP

Regular expression to find in an array and to split a string

How to use preg_split() function to split strings based on regular expressions and how to use preg_grep() function to search through an entire array of strings looking for text that matches a regular expression.

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PHP

Search & Replace with Multiple Patterns and Callbacks

Learn how to use preg_replace_callback_array() and preg_replace_callback() functions to perform a regular expression search and replace using callbacks.

Categories
PHP

Search and replace with preg_replace()

Learn how to use the preg_replace() function to replace all occurrences of a pattern (regular expression) with replacement and get the modified result.