How can the performance of PHP scripts be optimized when processing files line by line using functions like file() and strip_tags()?

When processing files line by line in PHP using functions like file() and strip_tags(), the performance can be optimized by using the fopen() function to open the file pointer and read the file line by line with fgets(). This approach avoids loading the entire file into memory at once, which can be resource-intensive. Additionally, using functions like trim() instead of strip_tags() can help improve performance when processing each line. 

$filename = 'example.txt';
$handle = fopen($filename, 'r');

if ($handle) {
    while (($line = fgets($handle)) !== false) {
        // Process each line here
        $cleaned_line = trim($line); // Use trim() instead of strip_tags() for better performance
    }

    fclose($handle);
} else {
    echo "Error opening the file.";
}

Keywords

PHP file() strip_tags() performance optimization file processing

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