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	diff --git a/src/utils/utils.php b/src/utils/utils.php
	--- a/src/utils/utils.php
	+++ b/src/utils/utils.php
	@@ -892,6 +892,10 @@
	* for printing on a single log line.
	*/
	function phutil_loggable_string($string) {
	+ if (preg_match('/^[\x20-\x7E]+$/', $string)) {
	+ return $string;
	+ }
	+
	$result = '';

	static $c_map = array(
	@@ -901,7 +905,8 @@
	"\t" => '\\t',
	);

	- for ($ii = 0; $ii < strlen($string); $ii++) {
	+ $len = strlen($string);
	+ for ($ii = 0; $ii < $len; $ii++) {
	$c = $string[$ii];
	if (isset($c_map[$c])) {
	$result .= $c_map[$c];