PHP | show_source() Function

Last Updated : 03 Jul, 2019
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The show_source() function is an inbuilt function in PHP which is used to return a file with the PHP syntax highlighted. The syntax is highlighted by using HTML tags. Syntax: 
show_source( $filename, $return )
Parameters: This function accepts two parameters as mentioned above and described below:
  • $filename: It is required parameter. It specifies the file whose content to be display.
  • $return: It is optional boolean parameter. Its default value is FALSE. If it is set to TRUE, instead of printing it out, this function will return the highlighted code as a string.
Return Value: If it is set to TRUE then it returns the highlighted code as string. It will return TRUE on success or return FALSE on failure. Note:
  • This function is available for PHP 4.0.0 and newer version.
  • The color used for highlighting the PHP syntax can be set with the ini_set() function or in the php.ini file.
  • With this function entire file will be displayed, that may include sensitive data like passwords etc.
Below programs illustrate the show_source() function in PHP: Program 1: Below program save the file using file name show_source.php php 
<html>
<body>
<?php
show_source("show_source.php");
?>
</body>
</html>
Output: image Program 2: Below program save the file using file name source_code.php php 
<?php

// Loading XML document to $user
$user = <<<XML
<user>
    <username>Geeks123</username>
    <name>GeeksforGeeks</name>
    <phone>+91-XXXXXXXXXX</phone>
    <detail font-color="blue" font-size="24px">
        Noida, India
    </detail>
</user>
XML;

// Loading string as simple xml object

$xml = simplexml_load_string($user);

// Printing children element
foreach($xml->children() as $child) {
    echo "child node:" . $child . "</br>";
}

?>
main.php php 
<!DOCTYPE html>
<html>
<body>
<?php
show_source("source_code.php");
?>
</body>
</html>
Output: Reference: https://www.php.net/manual/en/function.show-source.php

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