How can PHP developers effectively search for specific data in a file, like in the example provided with searching for a PIN number?

To search for specific data in a file, such as a PIN number, PHP developers can use functions like `file_get_contents()` to read the contents of the file into a string, and then use `strpos()` or `preg_match()` to search for the desired data within that string. 

$file_contents = file_get_contents('data.txt');
$pin_number = '1234';

if(strpos($file_contents, $pin_number) !== false) {
    echo 'PIN number found in file.';
} else {
    echo 'PIN number not found in file.';
}

Keywords

PHP file handling fopen fgets strpos data search

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