How can a search function be implemented using PHP for searching through files?

To implement a search function using PHP for searching through files, you can use the `file_get_contents()` function to read the contents of each file and then use `strpos()` function to search for the desired keyword. You can loop through all the files in a directory using `scandir()` function and filter out non-text files using `pathinfo()` function. 

<?php
// Function to search for a keyword in files
function searchFiles($directory, $keyword) {
    $files = scandir($directory);
    
    foreach($files as $file) {
        if(is_file($directory . '/' . $file) && pathinfo($file, PATHINFO_EXTENSION) == 'txt') {
            $content = file_get_contents($directory . '/' . $file);
            if(strpos($content, $keyword) !== false) {
                echo "Keyword found in file: " . $file . "<br>";
            }
        }
    }
}

// Usage
$searchDirectory = 'path/to/directory';
$searchKeyword = 'example';
searchFiles($searchDirectory, $searchKeyword);
?>

Keywords

PHP search function file search file handling regular expressions

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