diff --git a/classes/helpers/FrmFormsHelper.php b/classes/helpers/FrmFormsHelper.php
index 6402aacf60..37a3b60235 100644
--- a/classes/helpers/FrmFormsHelper.php
+++ b/classes/helpers/FrmFormsHelper.php
@@ -1520,7 +1520,7 @@ public static function status_nice_name( $status ) {
 			'publish' => __( 'Published', 'formidable' ),
 		);
 
-		if ( ! in_array( $status, array_keys( $nice_names ), true ) ) {
+		if ( ! array_key_exists( $status, $nice_names ) ) {
 			$status = 'publish';
 		}
 
diff --git a/classes/views/shared/mb_adv_info.php b/classes/views/shared/mb_adv_info.php
index 13a8043194..7de43ce0f1 100644
--- a/classes/views/shared/mb_adv_info.php
+++ b/classes/views/shared/mb_adv_info.php
@@ -209,7 +209,7 @@
 			$classes .= in_array( $skey, array( 'siteurl', 'sitename', 'entry_count' ), true ) ? ' show_before_content show_after_content' : '';
 			$classes .= str_starts_with( $skey, 'default-' ) ? ' hide_frm_not_email_subject' : '';
 
-			if ( in_array( $skey, array_keys( $contextual_codes ), true ) ) {
+			if ( array_key_exists( $skey, $contextual_codes ) ) {
 				$classes .= ' frm_hidden';
 			}
 
diff --git a/phpcs-sniffs/Formidable/Sniffs/CodeAnalysis/PreferArrayKeyExistsSniff.php b/phpcs-sniffs/Formidable/Sniffs/CodeAnalysis/PreferArrayKeyExistsSniff.php
new file mode 100644
index 0000000000..d490378503
--- /dev/null
+++ b/phpcs-sniffs/Formidable/Sniffs/CodeAnalysis/PreferArrayKeyExistsSniff.php
@@ -0,0 +1,186 @@
+<?php
+/**
+ * Formidable_Sniffs_CodeAnalysis_PreferArrayKeyExistsSniff
+ *
+ * Detects in_array() with array_keys() and suggests using array_key_exists() instead.
+ *
+ * @package Formidable\Sniffs
+ */
+
+namespace Formidable\Sniffs\CodeAnalysis;
+
+use PHP_CodeSniffer\Sniffs\Sniff;
+use PHP_CodeSniffer\Files\File;
+
+/**
+ * Detects in_array($x, array_keys($arr)) and suggests array_key_exists($x, $arr).
+ *
+ * Bad:
+ * in_array( $status, array_keys( $nice_names ), true )
+ *
+ * Good:
+ * array_key_exists( $status, $nice_names )
+ */
+class PreferArrayKeyExistsSniff implements Sniff {
+
+	/**
+	 * Returns an array of tokens this test wants to listen for.
+	 *
+	 * @return array
+	 */
+	public function register() {
+		return array( T_STRING );
+	}
+
+	/**
+	 * Processes this test, when one of its tokens is encountered.
+	 *
+	 * @param File $phpcsFile The file being scanned.
+	 * @param int  $stackPtr  The position of the current token in the stack passed in $tokens.
+	 *
+	 * @return void
+	 */
+	public function process( File $phpcsFile, $stackPtr ) {
+		$tokens = $phpcsFile->getTokens();
+
+		// Check if this is in_array.
+		if ( strtolower( $tokens[ $stackPtr ]['content'] ) !== 'in_array' ) {
+			return;
+		}
+
+		// Find the opening parenthesis.
+		$openParen = $phpcsFile->findNext( T_WHITESPACE, $stackPtr + 1, null, true );
+
+		if ( false === $openParen || $tokens[ $openParen ]['code'] !== T_OPEN_PARENTHESIS ) {
+			return;
+		}
+
+		$closeParen = $tokens[ $openParen ]['parenthesis_closer'];
+
+		// Find the first argument (needle).
+		$needleStart = $phpcsFile->findNext( T_WHITESPACE, $openParen + 1, $closeParen, true );
+
+		if ( false === $needleStart ) {
+			return;
+		}
+
+		// Find the comma after the first argument.
+		$firstComma = $this->findNextCommaAtSameLevel( $phpcsFile, $tokens, $needleStart, $closeParen );
+
+		if ( false === $firstComma ) {
+			return;
+		}
+
+		// Find the second argument (haystack) - should be array_keys().
+		$haystackStart = $phpcsFile->findNext( T_WHITESPACE, $firstComma + 1, $closeParen, true );
+
+		if ( false === $haystackStart ) {
+			return;
+		}
+
+		// Check if the second argument is array_keys().
+		if ( $tokens[ $haystackStart ]['code'] !== T_STRING || strtolower( $tokens[ $haystackStart ]['content'] ) !== 'array_keys' ) {
+			return;
+		}
+
+		// Find the opening parenthesis of array_keys.
+		$arrayKeysOpenParen = $phpcsFile->findNext( T_WHITESPACE, $haystackStart + 1, $closeParen, true );
+
+		if ( false === $arrayKeysOpenParen || $tokens[ $arrayKeysOpenParen ]['code'] !== T_OPEN_PARENTHESIS ) {
+			return;
+		}
+
+		$arrayKeysCloseParen = $tokens[ $arrayKeysOpenParen ]['parenthesis_closer'];
+
+		// Get the array being passed to array_keys.
+		$arrayStart = $phpcsFile->findNext( T_WHITESPACE, $arrayKeysOpenParen + 1, $arrayKeysCloseParen, true );
+
+		if ( false === $arrayStart ) {
+			return;
+		}
+
+		// Get the array content (everything inside array_keys parentheses).
+		$arrayContent = '';
+
+		for ( $i = $arrayStart; $i < $arrayKeysCloseParen; $i++ ) {
+			$arrayContent .= $tokens[ $i ]['content'];
+		}
+
+		// Get the needle content.
+		$needleContent = '';
+
+		for ( $i = $needleStart; $i < $firstComma; $i++ ) {
+			if ( $tokens[ $i ]['code'] !== T_WHITESPACE || $needleContent !== '' ) {
+				$needleContent .= $tokens[ $i ]['content'];
+			}
+		}
+
+		$needleContent = rtrim( $needleContent );
+
+		$fix = $phpcsFile->addFixableError(
+			'Use array_key_exists( %s, %s ) instead of in_array( %s, array_keys( %s ) ).',
+			$stackPtr,
+			'PreferArrayKeyExists',
+			array( $needleContent, $arrayContent, $needleContent, $arrayContent )
+		);
+
+		if ( true === $fix ) {
+			$this->applyFix( $phpcsFile, $tokens, $stackPtr, $closeParen, $needleContent, $arrayContent );
+		}
+	}
+
+	/**
+	 * Find the next comma at the same parenthesis level.
+	 *
+	 * @param File  $phpcsFile  The file being scanned.
+	 * @param array $tokens     The token stack.
+	 * @param int   $start      Start position.
+	 * @param int   $end        End position.
+	 *
+	 * @return false|int
+	 */
+	private function findNextCommaAtSameLevel( File $phpcsFile, array $tokens, $start, $end ) {
+		$depth = 0;
+
+		for ( $i = $start; $i < $end; $i++ ) {
+			if ( $tokens[ $i ]['code'] === T_OPEN_PARENTHESIS ) {
+				++$depth;
+			} elseif ( $tokens[ $i ]['code'] === T_CLOSE_PARENTHESIS ) {
+				--$depth;
+			} elseif ( $tokens[ $i ]['code'] === T_COMMA && 0 === $depth ) {
+				return $i;
+			}
+		}
+
+		return false;
+	}
+
+	/**
+	 * Apply the fix.
+	 *
+	 * @param File   $phpcsFile     The file being scanned.
+	 * @param array  $tokens        The token stack.
+	 * @param int    $stackPtr      Start of in_array.
+	 * @param int    $closeParen    Close parenthesis of in_array.
+	 * @param string $needleContent The needle argument content.
+	 * @param string $arrayContent  The array argument content.
+	 *
+	 * @return void
+	 */
+	private function applyFix( File $phpcsFile, array $tokens, $stackPtr, $closeParen, $needleContent, $arrayContent ) {
+		$phpcsFile->fixer->beginChangeset();
+
+		// Replace the entire in_array(...) with array_key_exists(...).
+		$replacement = 'array_key_exists( ' . $needleContent . ', ' . $arrayContent . ' )';
+
+		// Remove all tokens from in_array to closing paren.
+		for ( $i = $stackPtr; $i <= $closeParen; $i++ ) {
+			$phpcsFile->fixer->replaceToken( $i, '' );
+		}
+
+		// Add the replacement at the start position.
+		$phpcsFile->fixer->addContent( $stackPtr - 1, $replacement );
+
+		$phpcsFile->fixer->endChangeset();
+	}
+}
diff --git a/phpcs-sniffs/Formidable/ruleset.xml b/phpcs-sniffs/Formidable/ruleset.xml
index 564d5bdf34..de1262431d 100644
--- a/phpcs-sniffs/Formidable/ruleset.xml
+++ b/phpcs-sniffs/Formidable/ruleset.xml
@@ -37,6 +37,7 @@
 	<rule ref="Formidable.CodeAnalysis.PreferKsesEcho" />
 	<rule ref="Formidable.CodeAnalysis.PreferEscHtmlE" />
 	<rule ref="Formidable.CodeAnalysis.PreferArrayKeyFirstLast" />
+	<rule ref="Formidable.CodeAnalysis.PreferArrayKeyExists" />
 	<rule ref="Formidable.CodeAnalysis.MoveVariableBelowEarlyReturn" />
 	<rule ref="Formidable.CodeAnalysis.StrictComparisonForIntFunctions" />
 	<rule ref="Formidable.CodeAnalysis.FlipNegativeTernary" />
diff --git a/tests/phpunit/entries/test_FrmShowEntryShortcode.php b/tests/phpunit/entries/test_FrmShowEntryShortcode.php
index 61823b48d9..4834474571 100644
--- a/tests/phpunit/entries/test_FrmShowEntryShortcode.php
+++ b/tests/phpunit/entries/test_FrmShowEntryShortcode.php
@@ -907,7 +907,7 @@ protected function is_field_included( $atts, $field, $field_value ) {
 	}
 
 	protected function is_self_or_parent_in_array( $field_key, $array ) {
-		return in_array( $field_key, array_keys( $array ), true );
+		return array_key_exists( $field_key, $array );
 	}
 
 	protected function user_info_rows( $atts ) {