In PHP, you can insert characters into strings using their octal values. This is done by using a backslash
followed by a three-digit octal number (e.g., \101 outputs the uppercase letter A). Below is a
comprehensive list of octal codes for common control and printable characters.
| Character | Octal Code | Description |
|---|---|---|
| NULL | \000 | Null character |
| BELL | \007 | Bell character / Sound signal |
| TAB | \011 | Horizontal tab |
| LF | \012 | Line feed / Newline |
| CR | \015 | Carriage return |
| SPC | \040 | Space |
| ! | \041 | Exclamation mark |
| " | \042 | Double quote |
| # | \043 | Hash / Pound |
| $ | \044 | Dollar sign |
| ' | \047 | Single quote |
| ( | \050 | Left parenthesis |
| ) | \051 | Right parenthesis |
| * | \052 | Asterisk |
| + | \053 | Plus sign |
| , | \054 | Comma |
| - | \055 | Minus sign |
| . | \056 | Period / Dot |
| / | \057 | Slash / Forward slash |
| 0 | \060 | Number 0 |
| 1 | \061 | Number 1 |
| 2 | \062 | Number 2 |
| 3 | \063 | Number 3 |
| 4 | \064 | Number 4 |
| 5 | \065 | Number 5 |
| 6 | \066 | Number 6 |
| 7 | \067 | Number 7 |
| 8 | \070 | Number 8 |
| 9 | \071 | Number 9 |
| A | \101 | Uppercase letter A |
| B | \102 | Uppercase letter B |
| C | \103 | Uppercase letter C |
| D | \104 | Uppercase letter D |
| E | \105 | Uppercase letter E |
| F | \106 | Uppercase letter F |
| G | \107 | Uppercase letter G |
| H | \110 | Uppercase letter H |
| I | \111 | Uppercase letter I |
| J | \112 | Uppercase letter J |
| K | \113 | Uppercase letter K |
| L | \114 | Uppercase letter L |
| M | \115 | Uppercase letter M |
| N | \116 | Uppercase letter N |
| O | \117 | Uppercase letter O |
| P | \120 | Uppercase letter P |
| Q | \121 | Uppercase letter Q |
| R | \122 | Uppercase letter R |
| S | \123 | Uppercase letter S |
| T | \124 | Uppercase letter T |
| U | \125 | Uppercase letter U |
| V | \126 | Uppercase letter V |
| W | \127 | Uppercase letter W |
| X | \130 | Uppercase letter X |
| Y | \131 | Uppercase letter Y |
| Z | \132 | Uppercase letter Z |
| a | \141 | Lowercase letter a |
| b | \142 | Lowercase letter b |
| c | \143 | Lowercase letter c |
| d | \144 | Lowercase letter d |
| e | \145 | Lowercase letter e |
| f | \146 | Lowercase letter f |
| g | \147 | Lowercase letter g |
| h | \150 | Lowercase letter h |
| i | \151 | Lowercase letter i |
| j | \152 | Lowercase letter j |
| k | \153 | Lowercase letter k |
| l | \154 | Lowercase letter l |
| m | \155 | Lowercase letter m |
| n | \156 | Lowercase letter n |
| o | \157 | Lowercase letter o |
| p | \160 | Lowercase letter p |
| q | \161 | Lowercase letter q |
| r | \162 | Lowercase letter r |
| s | \163 | Lowercase letter s |
| t | \164 | Lowercase letter t |
| u | \165 | Lowercase letter u |
| v | \166 | Lowercase letter v |
| w | \167 | Lowercase letter w |
| x | \170 | Lowercase letter x |
| y | \171 | Lowercase letter y |
| z | \172 | Lowercase letter z |
| { | \173 | Left curly bracket |
| | | \174 | Vertical bar / Pipe |
| } | \175 | Right curly bracket |
| ~ | \176 | Tilde |