fix deprecated curly braces of PHP 7.4

.gitignore

@@ -3,3 +3,5 @@
 /src/autoload.php
 
 .idea/
+
+.DS_Store

src/kint-php/kint/inc/kintParser.class.php

@@ -460,9 +460,9 @@ private static function _parse_object( &$variable, kintVariableData $variableDat
 			 * These prepended values have null bytes on either side.
 			 * http://www.php.net/manual/en/language.types.array.php#language.types.array.casting
 			 */
-			if ( $key{0} === "\x00" ) {
+			if ( $key[0] === "\x00" ) {
 
-				$access = $key{1} === "*" ? "protected" : "private";
+  			$access = $key[1] === "*" ? "protected" : "private";	
 
 				// Remove the access level from the variable name
 				$key = substr( $key, strrpos( $key, "\x00" ) + 1 );

src/kint-php/kint/parsers/custom/color.php

@@ -82,16 +82,16 @@ private static function _convert( $color )
 			$color            = self::$_css3Named[ $color ];
 		}
 
-		if ( $color{0} === '#' ) {
+		if ( $color[0] === '#' ) {
 			$variants['hex'] = $color;
 			$color           = substr( $color, 1 );
 			if ( strlen( $color ) === 6 ) {
 				$colors = str_split( $color, 2 );
 			} else {
 				$colors = array(
-					$color{0} . $color{0},
-					$color{1} . $color{1},
-					$color{2} . $color{2},
+					$color[0] . $color[0],
+					$color[1] . $color[1],
+					$color[2] . $color[2],
 				);
 			}
 

src/kint-php/kint/parsers/custom/json.php

@@ -6,7 +6,7 @@ protected function _parse( & $variable )
 	{
 		if ( !KINT_PHP53
 			|| !is_string( $variable )
-			|| !isset( $variable{0} ) || ( $variable{0} !== '{' && $variable{0} !== '[' )
+			|| !isset( $variable[0] ) || ( $variable[0] !== '{' && $variable[0] !== '[' )
 			|| ( $json = json_decode( $variable, true ) ) === null
 		) return false;