php Special Character Escape Sequences

Escape Sequence	Character Represented by Sequence
\0	An ASCII NUL (0x00) character.
\'	A single quote (“'”) character.
\"	A double quote (“"”) character.
\b	A backspace character.
\n	A newline (linefeed) character. 開新行
\r	A carriage return character.
\t	A tab character.
\Z	ASCII 26 (Control+Z). See note following the table.
\\	A backslash (“\”) character.
\%	A “%” character. See note following the table.
\_	A “_” character. See note following the table.

useful examples
==================

mysql> SELECT 'hello', '"hello"', '""hello""', 'hel''lo', '\'hello';
+-------+---------+-----------+--------+--------+
| hello | "hello" | ""hello"" | hel'lo | 'hello |
+-------+---------+-----------+--------+--------+

mysql> SELECT "hello", "'hello'", "''hello''", "hel""lo", "\"hello";
+-------+---------+-----------+--------+--------+
| hello | 'hello' | ''hello'' | hel"lo | "hello |
+-------+---------+-----------+--------+--------+

mysql> SELECT 'This\nIs\nFour\nLines';
+--------------------+
| This
Is
Four
Lines |
+--------------------+

mysql> SELECT 'disappearing\ backslash';
+------------------------+
| disappearing backslash |
+------------------------+