What potential pitfalls can arise when using preg_match_all and file_get_contents in PHP?

When using preg_match_all and file_get_contents in PHP, potential pitfalls can arise if the file retrieval fails or if the regular expression used in preg_match_all does not match the content fetched by file_get_contents. To solve this, it is important to check for errors when using file_get_contents and validate the content before applying the regular expression. 

$url = 'https://example.com/data.txt';
$content = file_get_contents($url);

if ($content === false) {
    die('Failed to retrieve content from URL');
}

if (preg_match_all('/pattern/', $content, $matches)) {
    // Process the matches
} else {
    die('No matches found in content');
}

Keywords

preg_match_all file_get_contents regex data extraction error handling

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