Complete PHP function library

PHP is a popular web programming language that has many built-in functions and extensions that allow developers to write web applications easily. In this article, we will introduce some PHP function libraries, which have both built-in functions and third-party extensions.

1. Built-in function library

1. String operation function library

The string function library in PHP includes commonly used operation functions, such as string interception , replace, match, compare, etc.

Commonly used functions:

• strlen($str): Returns the length of the string.
• substr($str, $start, $length): Returns a string interception fragment.
• str_replace($search, $replace, $str): Replace specified characters in the string.
• strpos($str, $needle): Find the position of the specified character in the string.
• strcmp($str1, $str2): Compare two strings to see if they are the same.
• strtolower($str): Convert the string to lowercase letters.
• strtoupper($str): Convert the string to uppercase letters.

2. Array function library

The array function library in PHP is used to operate arrays, including sorting, traversing, merging, calculations, etc.

Commonly used functions:

• sort($array): Arrange the array in ascending order.
• rsort($array): Sort the array in descending order.
• array_sum($array): Calculate the sum of array elements.
• array_merge($array1, $array2): Merge two arrays.
• array_search($needle, $haystack): Find the specified element in the array and return its key name.
• array_key_exists($key, $array): Check whether the specified key name exists in the array.

3. File operation function library

The file operation function library in PHP is used to operate files, including reading, writing, creating, deleting, renaming, etc. wait.

Commonly used functions:

• fopen($filename, $mode): Open a file and return the file handle.
• fread($handle, $length): Read data of the specified length from the file.
• fwrite($handle, $string): Write a string to the file.
• fclose($handle): Close the file handle.
• file_exists($filename): Check whether the file exists.
• unlink($filename): Delete the specified file.
• rename($oldname, $newname): Rename the specified file.

4. Time and date function library

The time and date function library in PHP is used to operate on time and date, including formatting, calculation and conversion etc.

Commonly used functions:

• date($format[, $timestamp]): Format the timestamp into the specified date and time format.
• strtotime($time): Convert datetime string to timestamp.
• time(): Returns the timestamp of the current time.
• mktime($hour[, $minute[, $second[, $month[, $day[, $year]]]]]): Returns the timestamp of the specified date and time.
• strftime($format[, $timestamp]): Format the date and time into the specified date and time string.

2. Third-party function library

1. Composer

Composer is the most popular dependency manager in PHP, which can automatically download and Install dependencies and load them automatically. It can also package your project into a deployable package.

Commonly used components:

• monolog/monolog: powerful logging package.
• symfony/console: Component for creating command line applications.
• guzzlehttp/guzzle: Component for HTTP client.
• swiftmailer/swiftmailer: component for sending emails.

2. Laravel

Laravel is a popular web development framework that provides many built-in functions and class libraries to simplify web development. It also has a powerful MVC architecture, making it easy for developers to build large-scale web applications.

Commonly used components:

• Blade: a simple and powerful template engine.
• Eloquent ORM: Excellent ORM for database access.
• Authentication: Built-in component for authentication and authorization.
• Artisan: Built-in component for command line tools.

3. Symfony

Symfony is a mature web development framework that provides many advanced features and tools to accelerate web development. It also has a rich MVC architecture and a powerful component system.

Commonly used components:

• HttpFoundation: A component that provides HTTP requests and responses.
• Routing: A component that provides routing functionality.
• Validator: Component used for form validation.
• Twig: Popular template engine component.

Summary:

PHP has a rich function and extension library, making Web development very convenient and simple. Developers can use these built-in or third-party function libraries to efficiently create web applications. In practice, to avoid code clutter or conflicts, developers should selectively use required functions and extensions to ensure code readability and maintainability.

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