PHP built-in functions

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PHP is a versatile programming language that offers a wide range of built-in functions to perform various tasks. These functions are organized into categories, such as string manipulation, array manipulation, file handling, date and time operations, and more. Here's an overview of some commonly used PHP built-in functions:

String Functions:

strlen(): Returns the length of a string.

str_replace(): Replaces all occurrences of a search string with a replacement string in a given string.

substr(): Returns a portion of a string.

strtolower() and strtoupper(): Converts a string to lowercase or uppercase, respectively.

trim(): Removes whitespace or other specified characters from the beginning and end of a string.

explode(): Splits a string into an array based on a delimiter.

implode() (or join()): Joins array elements with a string.

Array Functions:

count(): Returns the number of elements in an array.

array_push() and array_pop(): Add elements to the end of an array and remove the last element, respectively.

array_merge(): Combines two or more arrays into a single array.

array_filter(): Filters the elements of an array using a callback function.

array_search(): Searches for a value in an array and returns the corresponding key if found.

sort() and rsort(): Sorts an array in ascending or descending order.

array_slice(): Extracts a slice of an array.

File Functions:

file_get_contents(): Reads the contents of a file into a string.

file_put_contents(): Writes a string to a file.

fopen(), fclose(), fread(), and fwrite(): Functions for opening, closing, reading, and writing to files.

file_exists(): Checks if a file or directory exists.

is_file() and is_dir(): Checks if a path is a regular file or directory.

unlink(): Deletes a file.

Date and Time Functions:

date(): Formats a timestamp or the current date and time.

strtotime(): Parses a date/time string into a Unix timestamp.

time(): Returns the current Unix timestamp.

mktime(): Creates a Unix timestamp for a specified date and time.

strtotime(): Parses a date/time string into a Unix timestamp.

date_diff(): Calculates the difference between two dates.

Math Functions:

abs(): Returns the absolute value of a number.

round(), ceil(), and floor(): Functions for rounding numbers.

rand(): Generates a random integer.

min() and max(): Returns the minimum or maximum value from a list of numbers.

Database Functions:

mysqli_connect(), mysqli_query(), and others: Functions for working with MySQL databases.

PDO class: Provides an object-oriented interface for database access.

These are just a few examples of the many built-in functions in PHP. PHP's extensive standard library makes it a powerful tool for web development and other applications. Developers often use these functions to simplify common tasks and accelerate the development process.

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