How can PHP be used to locate a specific line number within a webpage's source code based on a search term?

To locate a specific line number within a webpage's source code based on a search term using PHP, we can read the webpage's source code into a string variable, then use functions like strpos to find the position of the search term. By counting the number of newline characters before the search term, we can determine the line number. 

<?php
// URL of the webpage
$url = 'https://example.com';

// Get the webpage source code
$html = file_get_contents($url);

// Search term
$searchTerm = 'specific term';

// Find the position of the search term
$position = strpos($html, $searchTerm);

// Count the number of newline characters before the search term
$lineNumber = substr_count(substr($html, 0, $position), "\n") + 1;

echo "The search term '$searchTerm' was found on line number $lineNumber.";
?>

Keywords

PHP DOMDocument DOMXPath XPath query HTML parsing

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