What are some PHP functions that can be used to search through text or XML files?

Searching through text or XML files in PHP can be done using functions like `strpos()`, `preg_match()`, or `simplexml_load_file()`. `strpos()` can be used to find the position of a substring within a string, `preg_match()` can be used for more complex pattern matching using regular expressions, and `simplexml_load_file()` can be used to parse and search through XML files. 

// Using strpos() to search for a substring in a text file
$file = file_get_contents('example.txt');
$searchTerm = 'search term';
if(strpos($file, $searchTerm) !== false) {
    echo 'Search term found in text file.';
} else {
    echo 'Search term not found in text file.';
}

// Using preg_match() to search for a pattern in a text file
$file = file_get_contents('example.txt');
$searchPattern = '/pattern/';
if(preg_match($searchPattern, $file)) {
    echo 'Pattern found in text file.';
} else {
    echo 'Pattern not found in text file.';
}

// Using simplexml_load_file() to search for a specific element in an XML file
$xml = simplexml_load_file('example.xml');
$searchElement = 'element_name';
if($xml->xpath("//{$searchElement}")) {
    echo 'Element found in XML file.';
} else {
    echo 'Element not found in XML file.';
}

Keywords

PHP functions search text files XML files parsing

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