apcu_rw_test.php

<?php

testAPCUMixedReadsAndWrites();

function testAPCUMixedReadsAndWrites() {
	$xhprof_shutdown_fn = null;
	if ( ( $_GET['profile'] ?? null ) === '1' ) {
		if ( function_exists( 'tideways_xhprof_enable' ) ) {
			tideways_xhprof_enable( TIDEWAYS_XHPROF_FLAGS_CPU );
			$xhprof_shutdown_fn = 'tideways_xhprof_disable';
		} elseif ( function_exists( 'tideways_enable' ) ) {
			tideways_enable( TIDEWAYS_XHPROF_FLAGS_CPU );
			$xhprof_shutdown_fn = 'tideways_disable';
		} elseif ( function_exists( 'xhprof_enable' ) ) {
			xhprof_enable( XHPROF_FLAGS_CPU );
			$xhprof_shutdown_fn = 'xhprof_disable';
		}
	}

	$overwrite = !empty( $_GET['overwrite'] );
	$minBytes = intval( $_GET['minSize'] ?? 128 );
	$maxBytes = intval( $_GET['maxSize'] ?? 1024 * 1024 );
	$keysCount = intval( $_GET['keysCount'] ?? 1000 );
	$keysPerRequest = intval( $_GET['keysPerRequest'] ?? $keysCount );
	$iterations = intval( $_GET['iterations'] ?? 1 );
	$ttl = intval( $_GET['ttl'] ?? 3600 );

	$referenceValue = null;
	$storeOK = 0;
	$storeFail = 0;
	foreach ( (array)array_rand( range( 1, $keysCount ), $keysPerRequest ) as $keyIndex ) {
		for ( $i = 0; $i < $iterations; ++$i ) {
			$copyKey = "global:testblobs:$keyIndex:$minBytes:$maxBytes";
			$copyValue = apcu_fetch( $copyKey );
			if ( $copyValue === false || $overwrite ) {
				$referenceValue = $referenceValue
					?? str_repeat( hash('sha256', microtime() ), (int)ceil( $maxBytes / 64 ) );
				$copyValue = substr( $referenceValue, 0, mt_rand( $minBytes, $maxBytes ) );
				$ok = apcu_store( $copyKey, $copyValue, $ttl );
				if ( $ok ) {
					++$storeOK;
				} else {
					++$storeFail;
				}
			}
		}
	}

	header( 'Content-Type: text/javascript' );

	$data = [ 'store_ok' => $storeOK, 'store_fail' => $storeFail ];
	if ( $xhprof_shutdown_fn !== null ) {
        $profile = $xhprof_shutdown_fn();
        uasort(
            $profile,
            function ( $a, $b ) {
                return $b['wt'] <=> $a['wt'];
            }
        );
		$data += [ 'profile' => $profile ];
	}

	echo json_encode( $data, JSON_PRETTY_PRINT );
}