A PHP file normally contains HTML tags, and some PHP scripting code. Below, we have an example of a simple PHP file, with a PHP script that uses a built-in PHP function " echo " to output the text "Hello World!"

PHP Write to File - fwrite() The fwrite() function is used to write to a file. The first parameter of fwrite() contains the name of the file to write to and the second parameter is the string to be written.

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PHP has over 1000 built-in functions that can be called directly, from within a script, to perform a specific task. Please check out our PHP reference for a complete overview of the PHP built-in functions .

<?php class Fruit { // Properties public $name; public $color; // Methods function set_name($name) { $this->name = $name; } function get_name() { return $this->name; }} $apple = new Fruit(); $banana = new Fruit(); $apple->set_name('Apple'); $banana->set_name('Banana'); echo $apple->get_name(); echo "<br>"; echo $banana->get_name();?>

When the user fills out the form above and clicks the submit button, the form data is sent for processing to a PHP file named "welcome.php". The form data is sent with the HTTP POST method. To display the submitted data you could simply echo all the variables. The "welcome.php" looks like this:

In the PHP file that receive this HTTP request (demo_ajax.php), we simply use the $_POST variable to retrieve the fname variable, and writes it as a response.

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Send the request off to a PHP file (gethint.php) on the server; Notice that q parameter is added to the url (gethint.php?q=" + str) And the str variable holds the content of the input field

The HTML <script> Tag. The HTML <script> tag is used to define a client-side script (JavaScript). The <script> element either contains script statements, or it points to an external script file through the src attribute. Common uses for JavaScript are image manipulation, form validation, and dynamic changes of content.