fprintf Type: function Syntaxe: fprintf(resource $handle, string $format [, mixed $args [, $mixed $...]] ) Example: // example 1: writing inside a text file Test: 10 $fp = fopen('file.txt', 'w'); fprintf($fp, "Test: %d", 10); fclose($fp); // example 2: writing to cli output (bypass output buffering), print "defabc" // in browser: print "abc" ob_start(); echo "abc"; fprintf(STDOUT, "def"); echo ob_get_clean(); Liens: secure.php.net/manual/en/function.fprintf.php Bypassing Output Buffering in PHP Example 2 in browser