PHP 语言的不同部分在内部被表示为类似 T_SR 的类型。PHP 在解析错误时输出这样的标识符，例如 "Parse error: unexpected T_SR, expecting ',' or ';' in script.php on line 10."。
你应该知道 T_SR 的含义。对于所有不知道的人，这里有一张表列出了这些标识符，PHP 语法和在手册中适当位置的参考。
表格 P-1. 代号
| 代号 | 语法 | 参考 |
|---|---|---|
| T_AND_EQUAL | &= | assignment operators |
| T_ARRAY | array() | array(), array syntax |
| T_ARRAY_CAST | (array) | type-casting |
| T_AS | as | foreach |
| T_BAD_CHARACTER | anything below ASCII 32 except \t (0x09), \n (0x0a) and \r (0x0d) | |
| T_BOOLEAN_AND | && | logical operators |
| T_BOOLEAN_OR | || | logical operators |
| T_BOOL_CAST | (bool) or (boolean) | type-casting |
| T_BREAK | break | break |
| T_CASE | case | switch |
| T_CHARACTER | ||
| T_CLASS | class | classes and objects |
| T_CLOSE_TAG | ?> or %> | |
| T_COMMENT | // or # | comments |
| T_CONCAT_EQUAL | .= | assignment operators |
| T_CONST | const | |
| T_CONSTANT_ENCAPSED_STRING | "foo" or 'bar' | string syntax |
| T_CONTINUE | continue | |
| T_CURLY_OPEN | ||
| T_DEC | -- | incrementing/decrementing operators |
| T_DECLARE | declare | declare |
| T_DEFAULT | default | switch |
| T_DIV_EQUAL | /= | assignment operators |
| T_DNUMBER | 0.12, etc | floating point numbers |
| T_DO | do | do..while |
| T_DOLLAR_OPEN_CURLY_BRACES | ${ | complex variable parsed syntax |
| T_DOUBLE_ARROW | => | array syntax |
| T_DOUBLE_CAST | (real), (double) or (float) | type-casting |
| T_ECHO | echo | echo() |
| T_ELSE | else | else |
| T_ELSEIF | elseif | elseif |
| T_EMPTY | empty | empty() |
| T_ENCAPSED_AND_WHITESPACE | ||
| T_ENDDECLARE | enddeclare | declare, alternative syntax |
| T_ENDFOR | endfor | for, alternative syntax |
| T_ENDFOREACH | endforeach | foreach, alternative syntax |
| T_ENDIF | endif | if, alternative syntax |
| T_ENDSWITCH | endswitch | switch, alternative syntax |
| T_ENDWHILE | endwhile | while, alternative syntax |
| T_END_HEREDOC | heredoc syntax | |
| T_EVAL | eval() | eval() |
| T_EXIT | exit or die | exit(), die() |
| T_EXTENDS | extends | extends, classes and objects |
| T_FILE | __FILE__ | constants |
| T_FOR | for | for |
| T_FOREACH | foreach | foreach |
| T_FUNCTION | function or cfunction | functions |
| T_GLOBAL | global | variable scope |
| T_IF | if | if |
| T_INC | ++ | incrementing/decrementing operators |
| T_INCLUDE | include() | include() |
| T_INCLUDE_ONCE | include_once() | include_once() |
| T_INLINE_HTML | ||
| T_INT_CAST | (int) or (integer) | type-casting |
| T_ISSET | isset() | isset() |
| T_IS_EQUAL | == | comparison operators |
| T_IS_GREATER_OR_EQUAL | >= | comparison operators |
| T_IS_IDENTICAL | === | comparison operators |
| T_IS_NOT_EQUAL | != or <> | comparison operators |
| T_IS_NOT_IDENTICAL | !== | comparison operators |
| T_SMALLER_OR_EQUAL | <= | comparison operators |
| T_LINE | __LINE__ | constants |
| T_LIST | list() | list() |
| T_LNUMBER | 123, 012, 0x1ac, etc | integers |
| T_LOGICAL_AND | and | logical operators |
| T_LOGICAL_OR | or | logical operators |
| T_LOGICAL_XOR | xor | logical operators |
| T_MINUS_EQUAL | -= | assignment operators |
| T_ML_COMMENT | /* and */ | comments |
| T_MOD_EQUAL | %= | assignment operators |
| T_MUL_EQUAL | *= | assignment operators |
| T_NEW | new | classes and objects |
| T_NUM_STRING | ||
| T_OBJECT_CAST | (object) | type-casting |
| T_OBJECT_OPERATOR | -> | classes and objects |
| T_OLD_FUNCTION | old_function | old_function |
| T_OPEN_TAG | <?php, <? or <% | escaping from HTML |
| T_OPEN_TAG_WITH_ECHO | <?= or <%= | escaping from HTML |
| T_OR_EQUAL | |= | assignment operators |
| T_PAAMAYIM_NEKUDOTAYIM | :: | :: |
| T_PLUS_EQUAL | += | assignment operators |
| T_PRINT | print() | print() |
| T_REQUIRE | require() | require() |
| T_REQUIRE_ONCE | require_once() | require_once() |
| T_RETURN | return | returning values |
| T_SL | << | bitwise operators |
| T_SL_EQUAL | <<= | assignment operators |
| T_SR | >> | bitwise operators |
| T_SR_EQUAL | >>= | assignment operators |
| T_START_HEREDOC | <<< | heredoc syntax |
| T_STATIC | static | variable scope |
| T_STRING | ||
| T_STRING_CAST | (string) | type-casting |
| T_STRING_VARNAME | ||
| T_SWITCH | switch | switch |
| T_UNSET | unset() | unset() |
| T_UNSET_CAST | (unset) | (not documented; casts to NULL) |
| T_USE | use | (not implemented) |
| T_VAR | var | classes and objects |
| T_VARIABLE | $foo | variables |
| T_WHILE | while | while, do..while |
| T_WHITESPACE | ||
| T_XOR_EQUAL | ^= | assignment operators |
| T_FUNC_C | __FUNCTION__ | constants, since PHP 4.3.0 |
| T_CLASS_C | __CLASS__ | constants, since PHP 4.3.0 |