Fix exception message of implode()

Author: kocsismate

ext/standard/string.c

@@ -1284,7 +1284,7 @@ PHP_FUNCTION(implode)
 		pieces = arg1_array;
 	} else {
 		if (arg1_str == NULL) {
-			zend_type_error("The first argument must be string");
+			zend_type_error("The first argument must be a string");
 			return;
 		}
 	}

ext/standard/tests/strings/implode1.phpt

@@ -125,15 +125,15 @@ string(29) "element11.07654321E-9element2"
 -- Iteration 9 --
 string(19) "element10.5element2"
 -- Iteration 10 --
-The first argument must be string
+The first argument must be a string
 -- Iteration 11 --
-The first argument must be string
+The first argument must be a string
 -- Iteration 12 --
-The first argument must be string
+The first argument must be a string
 -- Iteration 13 --
-The first argument must be string
+The first argument must be a string
 -- Iteration 14 --
-The first argument must be string
+The first argument must be a string
 -- Iteration 15 --
 string(17) "element11element2"
 -- Iteration 16 --

ext/standard/tests/strings/join_variation1.phpt

@@ -41,7 +41,7 @@ Warning: Array to string conversion in %s on line %d
 
 Warning: Array to string conversion in %s on line %d
 string(27) "ArrayTESTArrayTESTPHPTEST50"
-The first argument must be string
+The first argument must be a string
 
 Warning: Array to string conversion in %s on line %d