May 29th, 2019 
Nilesh Chaurasia Basic Built in Functions in PHP
PHP have many built-in functions that you can use this function and perform some basic task, for example, date(), time(), array() and many more.
More than 1000s built-in functions are defined in the PHP.
Some PHP Pre-defined Build in Functions
| date() | time() | strlen() | str_replace() |
| phpinfo() | php_uname() | extension_loaded() | Phpversion() |
| ini_set() | ini_get() | print() | copy() |
Example 1 – PHP Basic Built in Functions with Example
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<?php
echo "Today date is " . date("d/m/y");
echo "<br />";
echo "Today time is " . date("h:i:s");
?>
</body>
</html>
In the above code, we uses pre-defined “date” to show date and time.
Caution:If you use time function to show time than the output shown in seconds and known as “Epoch Time”.
date()
This function return date and time in the format provided to the functions. Where the formates of date are d/m/y or d-m-y.
time()
This function return time in the second format. The time is also shown by the date() function where the formate is h:i:s a or h:i:s A. Where is represent to minute.
strlen()
This function return the length of a string which was provided to the functions.
str_replace()
This function replaces a text to another text.
phpinfo()
This function returns the information about the configuration of PHP.
php_uname()
This function returns the information about the operating system where PHP is running on.
extension_loaded()
This function returns the information about a specific extension is loaded or not.
phpversion()
This function returns the information about which version of PHP is running.
ini_set()
This function is used to set the parameter or configuration option of a file.
ini_get()
This function is used to get the value of a parameter or configuration option of a file.
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