How can a file be read and parsed in PHP to extract URL strings?

To read and parse a file in PHP to extract URL strings, you can use functions like `file_get_contents()` to read the file and then use regular expressions or built-in PHP functions like `preg_match_all()` to extract the URLs. By defining a regular expression pattern that matches URLs, you can search the file content and extract the URLs into an array for further processing. 

$file_content = file_get_contents('file.txt');
$pattern = '/(https?:\/\/[^\s]+)/';
preg_match_all($pattern, $file_content, $matches);

$urls = $matches[0];

foreach ($urls as $url) {
    echo $url . PHP_EOL;
}

Keywords

PHP file handling parsing URL strings regular expressions

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