Fix join to implode

Author: dereuromark

PSR2R/Sniffs/PHP/RemoveFunctionAliasSniff.php

@@ -23,7 +23,7 @@ class RemoveFunctionAliasSniff implements \PHP_CodeSniffer_Sniff {
 		'is_real' => 'is_float',
 		'is_double' => 'is_float',
 		'is_writeable' => 'is_writable',
-		'join' => 'explode',
+		'join' => 'implode',
 		'key_exists' => 'array_key_exists', // Deprecated function
 		'sizeof' => 'count',
 		'strchr' => 'strstr',