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PHP Functions

In PHP a function is a predefined set of commands that are carried out when the function is called. In addition to being able to write your own functions, PHP has a number of predefine functions for you to use. Below are many functions we discuss in our various tutorials, with simple definitions and examples to follow.
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101 Articles in: PHP Functions - PHP Code - PHP Commands
Eval () PHP Function
How to evaluate the inputed text string as PHP using the eval function
IF - Using IF in PHP
IF - We use if in PHP to make a decision
Atan2 () PHP Function
How to calculate the arc tangent of two coordinates in radians using PHP
GoTo
How tutorial of how to use GoTo in PHP to skip over code.
Use PHP in a File That Supports Mixed Scripting Languages
How to use PHP in a file that supports mixed scripting languages
Abs () PHP Function
How to use the ABS () function in PHP to return the absolute value of a number
Acos () PHP Function
How to use the acos function to return the arccosine of a number using PHP.
Addslashes () PHP Function
How to used the PHP function addslashes to add slashes into form data
Do you know about PHP Arrays?
Array () PHP Function assigns data into an array
Asin () PHP Function
How to find the arcsine (asin) of a number using PHP.
Atan () PHP Function
This PHP function allows you to find the arctangent of a value in radians.
Base_convert () PHP Function
Converting one number base to another using PHP
Bindec () PHP Function
The bindec function is used to convert a binary string to a decimal in PHP.
Cal_days_in_month () PHP Function
This PHP function tells you how many days are in a given month in a given year.
Ceil () - Always Rounding Up
How to round up a number in PHP - Free simple tutorial to using the ceil () function
Cos () PHP Function
How to calculate the cosine of a number, in radians, using PHP.
Cosh () PHP Function
How to use the Cosh function in PHP to find the hyperbolic cosine
Is your PHP secure?
The crypt () function encrypts data in PHP. Data encryption through crypt is one way.
A Simple Guide to Writing Functions in PHP
Learn PHP from a simple web based tutorial. How to use functions in PHP, use the date function, or write your own functions. Page 2.
Decbin () PHP Function
The Decbin PHP Function is used to convert a decimal into a binary number.
Dechex () PHP Function
The dechex function is used to convert a decimal number into a hexadecimal number.
Decoct () PHP Function
The Decoct PHP Function is used to convert a decimal into an octal number
Easter_date () PHP Function
PHP function that calculates what day Easter Sunday falls on in any given year.
Echo () PHP Function
Echo Function in PHP outputs (echos) the data to the page
A Beginner's Guide to Learning PHP
Learn PHP from a simple web based tutorial. Learn to use conditional statements in PHP programing.
How to Use 'Elseif()' Functions in PHP
Elseif () is used in conditional statements to make choices.
Eval () PHP Function
Eval () is used to evaluate its input string as PHP and then process it as such
Exp () PHP Function
The Exp () PHP Function is used to calculate e raised to the power of x.
Feof PHP Function
The FEOF PHP function is used to test for the end of the file.
Use FGETS in PHP
Fgets is a PHP function that gets data from an external file line by line.
Using FILE in PHP
The PHP Function File () pulls data from an outside file and puts it into an array to be included in the program as demonstrated in our tutorial.
File_Get_Contents () PHP Function
File_get_contents reads the data from a file and returns it to the PHP file as a string as demonstrated in our tutorial.
Floor () - Always Rounding Down
How to round down a number in PHP - Free simple tutorial to using the floor () function
fopen () PHP Function
Use fopen() to open up a file from php
An Introduction to Loops in PHP
Learn PHP from a simple web based tutorial. Learn to use the three types of loops - WHILE, FOR, and FOREACH loops in PHP programing. Page 2.
An Introduction to Loops in PHP
Learn PHP from a simple web based tutorial. Learn to use the three types of loops - WHILE, FOR, and FOREACH loops in PHP programing. Page 3.
Use FREAD in PHP
Fread is a php function used to read the contents of a file and report the data back to the php file as demonstrated with our tutorial.
Use FWRITE in PHP
fwrite is a binary safe file write used to write to an external file from PHP
Getenv () PHP Function
Free tutorial about how to use the getenv() command in PHP to get such things as the document root, or the user's IP address.
Get_magic_quotes_gpc PHP Function
Check if magic quotes is turned on or off in your php configuration.
Hexdec () PHP Function
The Hexdec () PHP Function is used to convert a hexadecimal into a decimal number
There is a function for special characters?
Htmlspecialchars is used to convert special characters to HTML entities
Right Triangle -
What is the Hypotenuse?
How to calculate the Hypotenuse of a right triangle using PHP and the hypot function
Can you edit images with PHP?
The ImageColorAllocate () function is used in PHP to set the color for an image you are creating.
Imagecreate () PHP Function
The imagecreate () function is used in PHP to create a new palette based image
Imagecreatetruecolor () PHP Function
The imagecreatetruecolor () function is used in PHP to create a new true color image.
How to Autogenerate Graphics and Images with GD Library and PHP Code
You can use the GD Library in PHP to dynamically create images
How to Autogenerate Graphics and Images with GD Library and PHP Code
gd library, gd, library, image, image creation, create image, PHP, online, code, HTML, SQL, how to, reference, example, tutorial, learn, programing, web page, web site, interactive, dynamic
How to Autogenerate Graphics and Images with GD Library and PHP Code
You can use the GD Library in PHP to dynamically create images
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Drawing a Polygon with PHP
How to draw a polygon in PHP using the imagepolygon function and assigning the coordinates of each corner
Imagepolygon () PHP Function
How to draw a polygon in PHP using the imagepolygon function and assigning the coordinates of each corner
Imagerotate () PHP Function
How to rotate an image using PHP with the GD Library
Imagestring () PHP Function
Image String is used to add a string (text) to an image
Include () PHP Function
Include external files within a PHP file
Is_Binary () PHP Function
This Is_Binary function in PHP is used to check if the input is a binary number.
Is_Numeric () PHP Function
The PHP function is_numeric is used to check if a variable is a number.
Is_string () PHP Function
The is_string php function is used to check if the value is a string. It will return true or false.
Mail () PHP Function
Sending email from PHP with mail ()
Max () PHP Function
The Max () php function returns the largest number in an array or group of numbers
Min () PHP Function
The Min () php function returns the lowest number in an array or group of numbers
Mktime () PHP Function
Mktime is used to get the timestamp for a specific date
Mysql_close () PHP Function
How to close a MySQL Connection from a PHP file
Mysql_connect() PHP Function
How to connect to your MySQL database from a PHP document
Mysql_error () PHP Function
Report an error into PHP from MySQL when your SQL code encounters problems
Number_format () PHP Function
Format the decimal and 1000 separators, as well as the number of decimals places in a number
Octdec () PHP Function
The Octdec PHP Function is used to convert from an octal number to a decimal
PHP Log () Function
How to use the PHP Log function to find the natural logarithm.
PHPinfo () PHP Function
Learn more about the version of PHP your server is running using the php info command to see your version, path, and specific settings.
Pi () PHP Function
How to use the PI () PHP function as well as M_PI, M_PI_2, M_PI_4, M_1_PI, M_2_PI, M_SQRTPI, M_2_SQRTPI in your PHP code
Pow () PHP Function
How to use exponents in PHP to raise a number to the power of another number.
Preg_grep () PHP Function
Using Preg_grep to search an array and return an array
Preg_match () PHP Function
Searching a string and returning a true or false with preg_match
Preg_match_all () PHP Function
Searching an entire string for specified terms, and outputting to an array
Preg_replace () PHP Function
Performing a find and replace on a string or an array.
Preg_split () PHP Function
Splitting a string into an array based on your specifications
Print () PHP Function
Print () PHP Function
Print_r () PHP Function
Print_R is used to return an array in a human readable form in PHP
Rad2Deg () PHP Function
The Rad2Deg PHP Function is used to convert an angle measured in radians to one measured in degrees.
Rand () PHP Function
Generating a random number in PHP with the rand () function
Require () PHP Function
Include external files within a PHP file
Round () PHP Function
Rounding a number to a specified amount of decimals
Session_destroy () PHP Function
Session_destroy () is used to destroy all the data in a current session
Session_set_cookie_params () PHP Function
Session_set_cookie_params () is used to set the duration of a session cookie, as well as other optional cookie information
Session_start() PHP Function
The session_start() function is used at the beginning of all PHP pages utilizing sessions.
Session_unset () PHP Function
Session_unset() is used to clear all the variables in a session
Setcookie () PHP Function
A cookie is used to store information about a user on their computer
Sin () PHP Function
How to use the sine (sin) function to do mathematics in PHP
Sinh () PHP Function
How to use the Sinh PHP Function to determine the hyperbolic sine in PHP
Sqrt () PHP Function
Sqrt () PHP Function
Stripslashes () PHP Function
Stripslashes is used to remove blackslashes from data in php
Str_replace () PHP Function
Str_replace is used to find and replace parts of a string in PHP
Substr () PHP Function
How to use the Stbstr PHP Function to return part of a string in PHP
Switch () PHP Function
The PHP switch () function is used in replace of multiple if or elseif statements.
Tan () PHP Function
How to use the tangent (tan) function to do mathematics in PHP
Tanh () PHP Function
The Tanh PHP Function is used to find the hyperbolic tangent of the imputed number.
Time () PHP Function
Accessing the server time and formatting it
Uniqid () PHP Function
PHP code to generate a random unique user ID
Unset () PHP Function
Unset is used to destroy specified variables in PHP
While () PHP Function
While () is a form of loop in PHP
All PHP Functions
Learn all available PHP functions and what use each of them does in PHP.
Variations of Pi
The different mathematical variations of PI built into PHP.
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