diff --git a/src/Utils/Callback.php b/src/Utils/Callback.php
index 735eac57b..98acea615 100644
--- a/src/Utils/Callback.php
+++ b/src/Utils/Callback.php
@@ -93,7 +93,7 @@ public static function toReflection($callable): \ReflectionFunctionAbstract
 			$callable = self::unwrap($callable);
 		}
 
-		if (is_string($callable) && strpos($callable, '::')) {
+		if (is_string($callable) && str_contains($callable, '::')) {
 			return new \ReflectionMethod($callable);
 		} elseif (is_array($callable)) {
 			return new \ReflectionMethod($callable[0], $callable[1]);
@@ -120,7 +120,7 @@ public static function isStatic(callable $callable): bool
 	public static function unwrap(\Closure $closure): callable
 	{
 		$r = new \ReflectionFunction($closure);
-		if (substr($r->name, -1) === '}') {
+		if (str_ends_with($r->name, '}')) {
 			return $closure;
 
 		} elseif ($obj = $r->getClosureThis()) {
diff --git a/src/Utils/Html.php b/src/Utils/Html.php
index f86c51bf9..ac67e0e74 100644
--- a/src/Utils/Html.php
+++ b/src/Utils/Html.php
@@ -805,14 +805,14 @@ final public function attributes(): string
 				$value = (string) $value;
 			}
 
-			$q = strpos($value, '"') === false ? '"' : "'";
+			$q = str_contains($value, '"') ? "'" : '"';
 			$s .= ' ' . $key . '=' . $q
 				. str_replace(
 					['&', $q, '<'],
 					['&amp;', $q === '"' ? '&quot;' : '&#39;', self::$xhtml ? '&lt;' : '<'],
 					$value,
 				)
-				. (strpos($value, '`') !== false && strpbrk($value, ' <>"\'') === false ? ' ' : '')
+				. (str_contains($value, '`') && strpbrk($value, ' <>"\'') === false ? ' ' : '')
 				. $q;
 		}
 
diff --git a/src/Utils/Image.php b/src/Utils/Image.php
index 05c052996..bc8c7f01f 100644
--- a/src/Utils/Image.php
+++ b/src/Utils/Image.php
@@ -670,7 +670,7 @@ public function __clone()
 
 	private static function isPercent(int|string &$num): bool
 	{
-		if (is_string($num) && substr($num, -1) === '%') {
+		if (is_string($num) && str_ends_with($num, '%')) {
 			$num = (float) substr($num, 0, -1);
 			return true;
 		} elseif (is_int($num) || $num === (string) (int) $num) {
diff --git a/src/Utils/Strings.php b/src/Utils/Strings.php
index f6bfb9f44..6e7b35cf0 100644
--- a/src/Utils/Strings.php
+++ b/src/Utils/Strings.php
@@ -62,7 +62,7 @@ public static function chr(int $code): string
 	 */
 	public static function startsWith(string $haystack, string $needle): bool
 	{
-		return strncmp($haystack, $needle, strlen($needle)) === 0;
+		return str_starts_with($haystack, $needle);
 	}
 
 
@@ -71,7 +71,7 @@ public static function startsWith(string $haystack, string $needle): bool
 	 */
 	public static function endsWith(string $haystack, string $needle): bool
 	{
-		return $needle === '' || substr($haystack, -strlen($needle)) === $needle;
+		return str_ends_with($haystack, $needle);
 	}
 
 
@@ -80,7 +80,7 @@ public static function endsWith(string $haystack, string $needle): bool
 	 */
 	public static function contains(string $haystack, string $needle): bool
 	{
-		return strpos($haystack, $needle) !== false;
+		return str_contains($haystack, $needle);
 	}
 
 
diff --git a/src/Utils/Validators.php b/src/Utils/Validators.php
index 4f7b09a3c..7d1e57779 100644
--- a/src/Utils/Validators.php
+++ b/src/Utils/Validators.php
@@ -131,12 +131,12 @@ public static function assertField(
 	public static function is(mixed $value, string $expected): bool
 	{
 		foreach (explode('|', $expected) as $item) {
-			if (substr($item, -2) === '[]') {
+			if (str_ends_with($item, '[]')) {
 				if (is_iterable($value) && self::everyIs($value, substr($item, 0, -2))) {
 					return true;
 				}
 				continue;
-			} elseif (substr($item, 0, 1) === '?') {
+			} elseif (str_starts_with($item, '?')) {
 				$item = substr($item, 1);
 				if ($value === null) {
 					return true;