diff --git a/4dev/tests/CoreLibsDebugMemoryUsageTest.php b/4dev/tests/CoreLibsDebugMemoryUsageTest.php
new file mode 100644
index 00000000..7b8e0205
--- /dev/null
+++ b/4dev/tests/CoreLibsDebugMemoryUsageTest.php
@@ -0,0 +1,119 @@
+<?php
+
+declare(strict_types=1);
+
+namespace tests;
+
+use PHPUnit\Framework\TestCase;
+use CoreLibs\Debug\MemoryUsage;
+
+/**
+ * Test class for Debug\MemoryUsage
+ * @coversDefaultClass \CoreLibs\Debug\MemoryUsage
+ * @testdox \CoreLibs\Debug\MemoryUsage method tests
+ */
+final class CoreLibsDebugMemoryUsageTest extends TestCase
+{
+	/**
+	 * Undocumented function
+	 *
+	 * @return array
+	 */
+	public function memoryUsageProvider(): array
+	{
+		$regex_raw_off = '/^\[[\w\s_-]+\] Peak\/Curr\/Change: \d+(\.\d+)? ?\w{1,2}\/'
+			. '\d+(\.\d+)? ?\w{1,2}\/'
+			. 'Since Start: \d+(\.\d+)? ?\w{1,2} \| '
+			. 'Since Last: \d+(\.\d+)? ?\w{1,2} \| '
+			. 'Since Set: \d+(\.\d+)? ?\w{1,2}$/';
+		$regex_raw_on = '/^\[[\w\s_-]+\] Peak\/Curr\/'
+			// . 'Change: \d+(\.\d+)? ?\w{1,2}\/\d+(\.\d+)? ?\w{1,2} \[\d+\]\/'
+			. 'Change: \d+(\.\d+)? ?\w{1,2}\/\d+(\.\d+)? ?\w{1,2}/'
+			. 'Since Start: \d+(\.\d+)? ?\w{1,2} \[\d+\] \| '
+			. 'Since Last: \d+(\.\d+)? ?\w{1,2} \[\d+\] \| '
+			. 'Since Set: \d+(\.\d+)? ?\w{1,2} \[\d+\]$/';
+		$regex_array = [
+			'prefix' => '/^[\w\s_-]+$/',
+			'peak' => '/^\d+$/',
+			'usage' => '/^\d+$/',
+			'start' => '/^\d+$/',
+			'last' => '/^\d+$/',
+			'set' => '/^\d+$/',
+		];
+		// 0: prefix
+		// 1: raw flag
+		// 2: set flags array
+		// 3: array output expected (as regex)
+		// 4: string output expected (as regex)
+		return [
+			'test normal' => [
+				'test',
+				null,
+				[],
+				$regex_array,
+				$regex_raw_off,
+			]
+		];
+	}
+
+	/**
+	 * Undocumented function
+	 *
+	 * @cover ::resetMemory
+	 * @cover ::debugMemoryFlag
+	 * @cover ::setStartMemory
+	 * @cover ::setMemory
+	 * @cover ::memoryUsage
+	 * @cover ::printMemoryUsage
+	 * @dataProvider memoryUsageProvider
+	 * @testdox memoryUsage with $prefix, raw memory $raw [$_dataName]
+	 *
+	 * @param  string    $prefix
+	 * @param  bool|null $raw
+	 * @param  array     $set_flags
+	 * @param  array     $expected_array
+	 * @param  string    $expected_string
+	 * @return void
+	 */
+	public function testMemoryUsage(
+		string $prefix,
+		?bool $raw,
+		array $settings,
+		array $expected_array,
+		string $expected_string
+	): void {
+		// always reeset to null
+		MemoryUsage::resetMemory();
+		MemoryUsage::debugMemoryFlag(true);
+		MemoryUsage::setStartMemory();
+		MemoryUsage::setMemory();
+		// run collector
+		$memory = MemoryUsage::memoryUsage($prefix);
+		if ($raw === null) {
+			$string = MemoryUsage::printMemoryUsage($memory);
+		} else {
+			$string = MemoryUsage::printMemoryUsage($memory, $raw);
+		}
+
+		// expected_array for each
+		foreach ($expected_array as $name => $regex) {
+			$this->assertMatchesRegularExpression(
+				$regex,
+				(string)$memory[$name],
+				'assert memory usage array ' . $name
+			);
+		}
+
+		// regex match string
+		$this->assertMatchesRegularExpression(
+			$expected_string,
+			$string,
+			'assert memory usage string as regex'
+		);
+
+		// TODO additional tests with use more memory and check diff matching
+		// TODO reset memory usage test
+	}
+}
+
+// __END__
diff --git a/www/admin/class_test.memoryusage.php b/www/admin/class_test.memoryusage.php
new file mode 100644
index 00000000..f4971f76
--- /dev/null
+++ b/www/admin/class_test.memoryusage.php
@@ -0,0 +1,91 @@
+<?php // phpcs:ignore warning
+
+/**
+ * @phan-file-suppress PhanTypeSuspiciousStringExpression
+ */
+
+declare(strict_types=1);
+
+$DEBUG_ALL_OVERRIDE = 0; // set to 1 to debug on live/remote server locations
+$DEBUG_ALL = 1;
+$PRINT_ALL = 1;
+$DB_DEBUG = 1;
+
+if ($DEBUG_ALL) {
+	error_reporting(E_ALL | E_STRICT | E_ERROR | E_WARNING | E_PARSE | E_COMPILE_ERROR);
+}
+
+ob_start();
+
+// basic class test file
+define('USE_DATABASE', false);
+// sample config
+require 'config.php';
+// define log file id
+$LOG_FILE_ID = 'classTest-memoryusage';
+ob_end_flush();
+
+use CoreLibs\Debug\MemoryUsage;
+use CoreLibs\Debug\Support;
+
+$log = new CoreLibs\Debug\Logging([
+	'log_folder' => BASE . LOG,
+	'file_id' => $LOG_FILE_ID,
+	// add file date
+	'print_file_date' => true,
+	// set debug and print flags
+	'debug_all' => $DEBUG_ALL ?? false,
+	'echo_all' => $ECHO_ALL ?? false,
+	'print_all' => $PRINT_ALL ?? false,
+]);
+
+$PAGE_NAME = 'TEST CLASS: MEMORY USAGE';
+print "<!DOCTYPE html>";
+print "<html><head><title>" . $PAGE_NAME . "</title><head>";
+print "<body>";
+print '<div><a href="class_test.php">Class Test Master</a></div>';
+print '<div><h1>' . $PAGE_NAME . '</h1></div>';
+
+MemoryUsage::debugMemoryFlag(true);
+print "Debug Flag: " . Support::printBool(MemoryUsage::debugMemoryFlag()) . "<br>";
+MemoryUsage::setStartMemory();
+MemoryUsage::setMemory();
+$data = MemoryUsage::memoryUsage('first run');
+print "Memory usage 1 array: " . Support::printAr($data) . "<br>";
+print "Memory usage 1 string: " . MemoryUsage::printMemoryUsage($data) . "<br>";
+print "Memory usage 1 string raw: " . MemoryUsage::printMemoryUsage($data, true) . "<br>";
+$var = 'foo';
+$out = '';
+for ($i = 1; $i <= 100; $i++) {
+	$out .= $var;
+}
+$data = MemoryUsage::memoryUsage('second run');
+print "Memory usage 2 array: " . Support::printAr($data) . "<br>";
+print "Memory usage 2 string: " . MemoryUsage::printMemoryUsage($data) . "<br>";
+print "Memory usage 2 string raw: " . MemoryUsage::printMemoryUsage($data, true) . "<br>";
+MemoryUsage::setMemory();
+$var = 'foasdfasdfasdfasdfasdfo';
+$out = '';
+for ($i = 1; $i <= 10000; $i++) {
+	$out .= $var;
+}
+$data = MemoryUsage::memoryUsage('third run');
+print "Memory usage 3 array: " . Support::printAr($data) . "<br>";
+print "Memory usage 3 string: " . MemoryUsage::printMemoryUsage($data) . "<br>";
+print "Memory usage 3 string raw: " . MemoryUsage::printMemoryUsage($data, true) . "<br>";
+$var = 'foasdfasdfasdasdfasdfasdfadfadfasdfasdfo';
+$out = '';
+for ($i = 1; $i <= 100000; $i++) {
+	$out .= $var;
+}
+$data = MemoryUsage::memoryUsage('forth run');
+print "Memory usage 4 array: " . Support::printAr($data) . "<br>";
+print "Memory usage 4 string: " . MemoryUsage::printMemoryUsage($data) . "<br>";
+print "Memory usage 4 string raw: " . MemoryUsage::printMemoryUsage($data, true) . "<br>";
+
+// error message
+print $log->printErrorMsg();
+
+print "</body></html>";
+
+// __END__
diff --git a/www/lib/CoreLibs/Debug/MemoryUsage.php b/www/lib/CoreLibs/Debug/MemoryUsage.php
new file mode 100644
index 00000000..f6090b27
--- /dev/null
+++ b/www/lib/CoreLibs/Debug/MemoryUsage.php
@@ -0,0 +1,129 @@
+<?php
+
+/*
+ * dump memory usage
+ */
+
+declare(strict_types=1);
+
+namespace CoreLibs\Debug;
+
+use CoreLibs\Convert\Byte;
+
+class MemoryUsage
+{
+	/** @var int */
+	private static $start_memory = 0;
+	/** @var int */
+	private static $set_memory = 0;
+	/** @var int */
+	private static $previous_memory = 0;
+	/** @var bool */
+	private static $debug_memory = false;
+
+	/**
+	 * set memory flag, or return set memory flag
+	 *
+	 * @param  bool|null $set_debug
+	 * @return bool
+	 */
+	public static function debugMemoryFlag(?bool $set_debug = null): bool
+	{
+		if ($set_debug === null) {
+			return self::$debug_memory;
+		}
+		self::$debug_memory = $set_debug;
+		return self::$debug_memory;
+	}
+
+	/**
+	 * Reset all memory variables to 0
+	 *
+	 * @return void
+	 */
+	public static function resetMemory(): void
+	{
+		self::$start_memory = 0;
+		self::$set_memory = 0;
+		self::$previous_memory = 0;
+	}
+
+	/**
+	 * set the start memory velue, or reset to a new start value
+	 *
+	 * @return void
+	 */
+	public static function setStartMemory(): void
+	{
+		self::$start_memory = memory_get_usage();
+	}
+
+	/**
+	 * set the and independent memory set for a sub tracking outside main
+	 *
+	 * @return void
+	 */
+	public static function setMemory(): void
+	{
+		self::$set_memory = memory_get_usage();
+	}
+
+	/**
+	 * calculate and set memory usage values
+	 * this will return an array with all the data that can be used in
+	 * printMemoryUsage for human readable output
+	 *
+	 * @param  string $prefix           A prefix tag
+	 * @return array<string,int|string> return array
+	 */
+	public static function memoryUsage(string $prefix): array
+	{
+		// skip if DEBUG is off
+		if (self::$debug_memory === false) {
+			return [];
+		}
+		if (empty(self::$start_memory)) {
+			self::$start_memory = memory_get_usage();
+		}
+		$memory_usage = memory_get_usage();
+		$data = [
+			'prefix' => $prefix,
+			'peak' => memory_get_peak_usage(),
+			'usage' => $memory_usage,
+			'start' => $memory_usage - self::$start_memory,
+			'last' => $memory_usage - self::$previous_memory,
+			'set' => $memory_usage - self::$set_memory
+		];
+		self::$previous_memory = $memory_usage;
+		return $data;
+	}
+
+	/**
+	 * returns a human readable output from the memoryUsage function
+	 * can be used for logging purpose
+	 *
+	 * @param  array<string,int|string> $data Data array from memoryUsage
+	 * @param  bool                     $raw  Flag to shaw unconverted memory numbers
+	 * @return string                         Return debug string with memory usage
+	 */
+	public static function printMemoryUsage(array $data, bool $raw = false): string
+	{
+		return
+			'[' . $data['prefix'] . '] Peak/Curr/Change: '
+			. Byte::humanReadableByteFormat($data['peak'])
+			. '/'
+			. Byte::humanReadableByteFormat($data['usage'])
+			// . ($raw === true ? ' [' . $data['usage'] . ']' : '')
+			. '/Since Start: '
+			. Byte::humanReadableByteFormat($data['start'])
+			. ($raw === true ? ' [' . $data['start'] . ']' : '')
+			. ' | Since Last: '
+			. Byte::humanReadableByteFormat($data['last'])
+			. ($raw === true ? ' [' . $data['last'] . ']' : '')
+			. ' | Since Set: '
+			. Byte::humanReadableByteFormat($data['set'])
+			. ($raw === true ? ' [' . $data['set'] . ']' : '');
+	}
+}
+
+// __END__
diff --git a/www/vendor/composer/autoload_classmap.php b/www/vendor/composer/autoload_classmap.php
index 37416b44..91a57e0c 100644
--- a/www/vendor/composer/autoload_classmap.php
+++ b/www/vendor/composer/autoload_classmap.php
@@ -37,6 +37,7 @@ return array(
     'CoreLibs\\DB\\SQL\\SqlInterface\\SqlFunctions' => $baseDir . '/lib/CoreLibs/DB/SQL/SqlInterface/SqlFunctions.php',
     'CoreLibs\\Debug\\FileWriter' => $baseDir . '/lib/CoreLibs/Debug/FileWriter.php',
     'CoreLibs\\Debug\\Logging' => $baseDir . '/lib/CoreLibs/Debug/Logging.php',
+    'CoreLibs\\Debug\\MemoryUsage' => $baseDir . '/lib/CoreLibs/Debug/MemoryUsage.php',
     'CoreLibs\\Debug\\RunningTime' => $baseDir . '/lib/CoreLibs/Debug/RunningTime.php',
     'CoreLibs\\Debug\\Support' => $baseDir . '/lib/CoreLibs/Debug/Support.php',
     'CoreLibs\\Get\\ReadEnvFile' => $baseDir . '/lib/CoreLibs/Get/ReadEnvFile.php',
diff --git a/www/vendor/composer/autoload_static.php b/www/vendor/composer/autoload_static.php
index 162ef581..9ec986ca 100644
--- a/www/vendor/composer/autoload_static.php
+++ b/www/vendor/composer/autoload_static.php
@@ -102,6 +102,7 @@ class ComposerStaticInit10fe8fe2ec4017b8644d2b64bcf398b9
         'CoreLibs\\DB\\SQL\\SqlInterface\\SqlFunctions' => __DIR__ . '/../..' . '/lib/CoreLibs/DB/SQL/SqlInterface/SqlFunctions.php',
         'CoreLibs\\Debug\\FileWriter' => __DIR__ . '/../..' . '/lib/CoreLibs/Debug/FileWriter.php',
         'CoreLibs\\Debug\\Logging' => __DIR__ . '/../..' . '/lib/CoreLibs/Debug/Logging.php',
+        'CoreLibs\\Debug\\MemoryUsage' => __DIR__ . '/../..' . '/lib/CoreLibs/Debug/MemoryUsage.php',
         'CoreLibs\\Debug\\RunningTime' => __DIR__ . '/../..' . '/lib/CoreLibs/Debug/RunningTime.php',
         'CoreLibs\\Debug\\Support' => __DIR__ . '/../..' . '/lib/CoreLibs/Debug/Support.php',
         'CoreLibs\\Get\\ReadEnvFile' => __DIR__ . '/../..' . '/lib/CoreLibs/Get/ReadEnvFile.php',