diff --git a/src/Str.php b/src/Str.php
index 0dac0bb..d969a6d 100644
--- a/src/Str.php
+++ b/src/Str.php
@@ -32,7 +32,7 @@ public static function camel(?string $subject): string
      *
      * @param ?string $subject
      * @param string $start
-     * @param bool   $caseSensitive
+     * @param bool $caseSensitive
      *
      * @return bool
      */
@@ -46,6 +46,84 @@ public static function startsWith(?string $subject, string $start, bool $caseSen
         return str_starts_with($subject, $start);
     }
 
+    /**
+     * Check if the given string ends with the specified substring
+     *
+     * @param ?string $subject
+     * @param string $end
+     * @param bool $caseSensitive
+     *
+     * @return bool
+     */
+    public static function endsWith(?string $subject, string $end, bool $caseSensitive = true): bool
+    {
+        $subject ??= '';
+        if (! $caseSensitive) {
+            return strncasecmp($subject, $end, strlen($end)) === 0;
+        }
+
+        return str_ends_with($subject, $end);
+    }
+
+    /**
+     * Check if the given string contains the specified substring
+     *
+     * @param ?string $subject
+     * @param string $needle
+     * @param bool $caseSensitive
+     *
+     * @return bool
+     */
+    public static function contains(?string $subject, string $needle, bool $caseSensitive = true): bool
+    {
+        $subject ??= '';
+        if (! $caseSensitive) {
+            return str_contains(strtolower($subject), strtolower($needle));
+        }
+
+        return str_contains($subject, $needle);
+    }
+
+    /**
+     * Check if the given string contains any of the specified substrings
+     *
+     * @param ?string $haystack
+     * @param string[] $needles
+     * @param bool $caseSensitive
+     *
+     * @return bool
+     */
+    public static function containsAny(?string $haystack, array $needles, bool $caseSensitive = true): bool
+    {
+        foreach ($needles as $needle) {
+            if (self::contains($haystack, $needle, $caseSensitive)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Check if the given string contains all the specified substrings
+     *
+     * @param ?string $haystack
+     * @param string[] $needles
+     * @param bool $caseSensitive
+     *
+     * @return bool
+     */
+    public static function containsAll(?string $haystack, array $needles, bool $caseSensitive = true): bool
+    {
+        foreach ($needles as $needle) {
+            if (! self::contains($haystack, $needle, $caseSensitive)) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
     /**
      * Split string into an array padded to the size specified by limit
      *
@@ -76,7 +154,7 @@ public static function symmetricSplit(
      *
      * @param ?string $subject
      * @param string $delimiter
-     * @param ?int    $limit
+     * @param ?int $limit
      *
      * @return array<string>
      */
@@ -90,4 +168,19 @@ public static function trimSplit(?string $subject, string $delimiter = ',', ?int
 
         return array_map('trim', $exploded);
     }
+
+    /**
+     * Check if the given string is empty
+     *
+     * Null is considered empty and strings are trimmed before checking.
+     *
+     * @param ?string $subject
+     * @param string $characters
+     *
+     * @return bool
+     */
+    public static function isEmpty(?string $subject, string $characters = " \n\r\t\v\0"): bool
+    {
+        return $subject === null || trim($subject, $characters) === '';
+    }
 }
diff --git a/tests/StrTest.php b/tests/StrTest.php
index d4c7075..48c4598 100644
--- a/tests/StrTest.php
+++ b/tests/StrTest.php
@@ -47,6 +47,162 @@ public function testStartsWithReturnsFalseIfStringDoesNotStartWithTheSpecifiedSu
         $this->assertFalse(Str::startsWith('FOOBAR', 'foo', true));
     }
 
+    public function testEndsWithReturnsTrueIfStringEndsWithTheSpecifiedSubstring()
+    {
+        $this->assertTrue(Str::endsWith('config.ini', '.ini'));
+    }
+
+    public function testEndsWithReturnsFalseIfStringDoesNotEndWithTheSpecifiedSubstring()
+    {
+        $this->assertFalse(Str::endsWith('config.ini', '.php'));
+    }
+
+    public function testEndsWithReturnsTrueIfStringEndsWithTheSpecifiedSubstringAndCaseIsStrict()
+    {
+        $this->assertTrue(Str::endsWith('config.INI', '.INI', true));
+    }
+
+    public function testEndsWithReturnsFalseIfStringDoesNotEndWithTheSpecifiedSubstringAndCaseIsStrict()
+    {
+        $this->assertFalse(Str::endsWith('config.INI', '.ini', true));
+    }
+
+    public function testContainsReturnsTrueIfStringContainsTheSpecifiedSubstring()
+    {
+        $this->assertTrue(Str::contains('MySQL server has gone away', 'server has gone away'));
+    }
+
+    public function testContainsReturnsFalseIfStringDoesNotContainTheSpecifiedSubstring()
+    {
+        $this->assertFalse(Str::contains('Query executed successfully', 'server has gone away'));
+    }
+
+    public function testContainsReturnsTrueIfStringContainsTheSpecifiedSubstringAndCaseIsStrict()
+    {
+        $this->assertTrue(Str::contains(
+            'Lost connection to MySQL server during query',
+            'Lost connection',
+            true,
+        ));
+    }
+
+    public function testContainsReturnsFalseIfStringDoesNotContainTheSpecifiedSubstringAndCaseIsStrict()
+    {
+        $this->assertFalse(Str::contains(
+            'lost connection to MySQL server during query',
+            'Lost connection',
+            true,
+        ));
+    }
+
+    public function testContainsAnyReturnsTrueIfStringContainsOneOfTheSpecifiedSubstrings()
+    {
+        $this->assertTrue(Str::containsAny('MySQL server has gone away', [
+            'server has gone away',
+            'Lost connection',
+            'Connection refused',
+        ]));
+    }
+
+    public function testContainsAnyReturnsFalseIfStringContainsNoneOfTheSpecifiedSubstrings()
+    {
+        $this->assertFalse(Str::containsAny('Query executed successfully', [
+            'server has gone away',
+            'Lost connection',
+            'Connection refused',
+        ]));
+    }
+
+    public function testContainsAnyReturnsTrueIfStringContainsOneOfTheSpecifiedSubstringsCaseInsensitively()
+    {
+        $this->assertTrue(Str::containsAny('LOST CONNECTION to MySQL server', [
+            'server has gone away',
+            'Lost connection',
+        ], false));
+    }
+
+    public function testContainsAnyReturnsFalseIfStringContainsNoneOfTheSpecifiedSubstringsAndCaseIsStrict()
+    {
+        $this->assertFalse(Str::containsAny('lost connection to MySQL server', [
+            'server has gone away',
+            'Lost connection',
+        ], true));
+    }
+
+    public function testContainsAllReturnsTrueIfStringContainsAllSpecifiedSubstrings()
+    {
+        $this->assertTrue(Str::containsAll(
+            'host=db1.example.com;dbname=icingaweb2;charset=utf8',
+            ['host=', 'dbname=', 'charset='],
+        ));
+    }
+
+    public function testContainsAllReturnsFalseIfStringIsMissingOneOfTheSpecifiedSubstrings()
+    {
+        $this->assertFalse(Str::containsAll(
+            'host=db1.example.com;charset=utf8',
+            ['host=', 'dbname=', 'charset='],
+        ));
+    }
+
+    public function testContainsAllReturnsTrueIfStringContainsAllSpecifiedSubstringsCaseInsensitively()
+    {
+        $this->assertTrue(Str::containsAll(
+            'HOST=db1.example.com;DBNAME=icingaweb2',
+            ['host=', 'dbname='],
+            false,
+        ));
+    }
+
+    public function testContainsAllReturnsFalseIfStringIsMissingOneOfTheSpecifiedSubstringsAndCaseIsStrict()
+    {
+        $this->assertFalse(Str::containsAll(
+            'HOST=db1.example.com;DBNAME=icingaweb2',
+            ['host=', 'dbname='],
+            true,
+        ));
+    }
+
+    public function testIsEmptyReturnsTrueForNull()
+    {
+        $this->assertTrue(Str::isEmpty(null));
+    }
+
+    public function testIsEmptyReturnsTrueForEmptyString()
+    {
+        $this->assertTrue(Str::isEmpty(''));
+    }
+
+    public function testIsEmptyReturnsTrueForStringWithLeadingAndTrailingWhitespace()
+    {
+        $this->assertTrue(Str::isEmpty('   '));
+    }
+
+    public function testIsEmptyReturnsTrueForStringWithOnlyWhitespace()
+    {
+        $this->assertTrue(Str::isEmpty("\t\n"));
+    }
+
+    public function testIsEmptyReturnsFalseForZero()
+    {
+        $this->assertFalse(Str::isEmpty('0'));
+    }
+
+    public function testIsEmptyReturnsFalseForNonEmptyString()
+    {
+        $this->assertFalse(Str::isEmpty('Warning'));
+    }
+
+    public function testIsEmptyReturnsFalseForStringWithContentAndSurroundingWhitespace()
+    {
+        $this->assertFalse(Str::isEmpty('  Warning  '));
+    }
+
+    public function testIsEmptyReturnsTrueForStringWithCustomCharacters()
+    {
+        $this->assertTrue(Str::isEmpty('---', '-'));
+    }
+
     public function testSymmetricSplitReturnsArrayPaddedToTheSizeSpecifiedByLimitUsingNullAsValueByDefault()
     {
         $this->assertSame(['foo', 'bar', null, null], Str::symmetricSplit('foo,bar', ',', 4));