formatting

src/Illuminate/Database/Query/Builder.php

@@ -2648,7 +2648,7 @@ public function insert(array $values)
     }
 
     /**
-     * Insert ignore a new record into the database.
+     * Insert a new record into the database while ignoring errors.
      *
      * @param  array  $values
      * @return int

src/Illuminate/Database/Query/Grammars/Grammar.php

@@ -881,7 +881,7 @@ public function compileInsert(Builder $query, array $values)
      */
     public function compileInsertOrIgnore(Builder $query, array $values)
     {
-        throw new RuntimeException('This database engine does not support insert or ignore.');
+        throw new RuntimeException('This database engine does not support inserting while ignoring errors.');
     }
 
     /**

src/Illuminate/Database/Query/Grammars/MySqlGrammar.php

@@ -2,6 +2,7 @@
 
 namespace Illuminate\Database\Query\Grammars;
 
+use Illuminate\Support\Str;
 use Illuminate\Database\Query\Builder;
 use Illuminate\Database\Query\JsonExpression;
 
@@ -63,7 +64,7 @@ public function compileSelect(Builder $query)
      */
     public function compileInsertOrIgnore(Builder $query, array $values)
     {
-        return substr_replace($this->compileInsert($query, $values), ' ignore', 6, 0);
+        return Str::replaceFirst('insert', 'insert ignore', $this->compileInsert($query, $values));
     }
 
     /**

src/Illuminate/Database/Query/Grammars/PostgresGrammar.php

@@ -217,11 +217,7 @@ public function compileInsertOrIgnore(Builder $query, array $values)
      */
     public function compileInsertGetId(Builder $query, $values, $sequence)
     {
-        if (is_null($sequence)) {
-            $sequence = 'id';
-        }
-
-        return $this->compileInsert($query, $values).' returning '.$this->wrap($sequence);
+        return $this->compileInsert($query, $values).' returning '.$this->wrap($sequence ?: 'id');
     }
 
     /**

src/Illuminate/Database/Query/Grammars/SQLiteGrammar.php

@@ -187,7 +187,7 @@ public function compileInsert(Builder $query, array $values)
      */
     public function compileInsertOrIgnore(Builder $query, array $values)
     {
-        return substr_replace($this->compileInsert($query, $values), ' or ignore', 6, 0);
+        return Str::replaceFirst('insert', 'insert or ignore', $this->compileInsert($query, $values));
     }
 
     /**

tests/Database/DatabaseQueryBuilderTest.php

@@ -1870,7 +1870,7 @@ function (Builder $query) {
     public function testInsertOrIgnoreMethod()
     {
         $this->expectException(RuntimeException::class);
-        $this->expectExceptionMessage('This database engine does not support insert or ignore.');
+        $this->expectExceptionMessage('does not support');
         $builder = $this->getBuilder();
         $builder->from('users')->insertOrIgnore(['email' => 'foo']);
     }
@@ -1902,7 +1902,7 @@ public function testSQLiteInsertOrIgnoreMethod()
     public function testSqlServerInsertOrIgnoreMethod()
     {
         $this->expectException(RuntimeException::class);
-        $this->expectExceptionMessage('This database engine does not support insert or ignore.');
+        $this->expectExceptionMessage('does not support');
         $builder = $this->getSqlServerBuilder();
         $builder->from('users')->insertOrIgnore(['email' => 'foo']);
     }