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# CXXVI. Tokenizer Functions

# 介紹

The tokenizer functions provide an interface to the PHP tokenizer embedded in the Zend Engine. Using these functions you may write your own PHP source analyzing or modification tools without having to deal with the language specification at the lexical level.

See also the appendix about tokens.

# 需求

建立這個延伸不需要任何外部程式庫。

# 安裝

Beginning with PHP 4.3.0 these functions are enabled by default. For older versions you have to configure and compile PHP with --enable-tokenizer. You can disable tokenizer support with --disable-tokenizer.

Windows 版本的 PHP 已內建此延伸的支援﹐所以你毋須再載入附加的延伸來使用這些功能。

> 注: Builtin support for tokenizer is available with PHP 4.3.0.

# 預先定義常數

以下的常數由此延伸定義，只在這個延伸被編譯成PHP或實行時期被動態載入時有效。

`T_INCLUDE` (integer)

`T_INCLUDE_ONCE` (integer)

`T_EVAL` (integer)

`T_REQUIRE` (integer)

`T_REQUIRE_ONCE` (integer)

`T_LOGICAL_OR` (integer)

`T_LOGICAL_XOR` (integer)

`T_LOGICAL_AND` (integer)

`T_PRINT` (integer)

`T_PLUS_EQUAL` (integer)

`T_MINUS_EQUAL` (integer)

`T_MUL_EQUAL` (integer)

`T_DIV_EQUAL` (integer)

`T_CONCAT_EQUAL` (integer)

`T_MOD_EQUAL` (integer)

`T_AND_EQUAL` (integer)

`T_OR_EQUAL` (integer)

`T_XOR_EQUAL` (integer)

`T_SL_EQUAL` (integer)

`T_SR_EQUAL` (integer)

`T_BOOLEAN_OR` (integer)

`T_BOOLEAN_AND` (integer)

`T_IS_EQUAL` (integer)

`T_IS_NOT_EQUAL` (integer)

`T_IS_IDENTICAL` (integer)

`T_IS_NOT_IDENTICAL` (integer)

`T_IS_SMALLER_OR_EQUAL` (integer)

`T_IS_GREATER_OR_EQUAL` (integer)

`T_SL` (integer)

`T_SR` (integer)

`T_INC` (integer)

`T_DEC` (integer)

`T_INT_CAST` (integer)

`T_DOUBLE_CAST` (integer)

`T_STRING_CAST` (integer)

`T_ARRAY_CAST` (integer)

`T_OBJECT_CAST` (integer)

`T_BOOL_CAST` (integer)

`T_UNSET_CAST` (integer)

`T_NEW` (integer)

`T_EXIT` (integer)

`T_IF` (integer)

`T_ELSEIF` (integer)

`T_ELSE` (integer)

`T_ENDIF` (integer)

`T_LNUMBER` (integer)

`T_DNUMBER` (integer)

`T_STRING` (integer)

`T_STRING_VARNAME` (integer)

`T_VARIABLE` (integer)

`T_NUM_STRING` (integer)

`T_INLINE_HTML` (integer)

`T_CHARACTER` (integer)

`T_BAD_CHARACTER` (integer)

`T_ENCAPSED_AND_WHITESPACE` (integer)

`T_CONSTANT_ENCAPSED_STRING` (integer)

`T_ECHO` (integer)

`T_DO` (integer)

`T_WHILE` (integer)

`T_ENDWHILE` (integer)

`T_FOR` (integer)

`T_ENDFOR` (integer)

`T_FOREACH` (integer)

`T_ENDFOREACH` (integer)

`T_DECLARE` (integer)

`T_ENDDECLARE` (integer)

`T_AS` (integer)

`T_SWITCH` (integer)

`T_ENDSWITCH` (integer)

`T_CASE` (integer)

`T_DEFAULT` (integer)

`T_BREAK` (integer)

`T_CONTINUE` (integer)

`T_OLD_FUNCTION` (integer)

  `T_OLD_FUNCTION` is not defined in PHP 5.

`T_FUNCTION` (integer)

`T_CONST` (integer)

`T_RETURN` (integer)

`T_USE` (integer)

`T_GLOBAL` (integer)

`T_STATIC` (integer)

`T_VAR` (integer)

`T_UNSET` (integer)

`T_ISSET` (integer)

`T_EMPTY` (integer)

`T_CLASS` (integer)

`T_EXTENDS` (integer)

`T_OBJECT_OPERATOR` (integer)

`T_DOUBLE_ARROW` (integer)

`T_LIST` (integer)

`T_ARRAY` (integer)

`T_LINE` (integer)

`T_FILE` (integer)

`T_COMMENT` (integer)

`T_ML_COMMENT` (integer)

  `T_ML_COMMENT` is not defined in PHP 5. All comments in PHP 5 are of token `T_COMMENT`.

`T_DOC_COMMENT` (integer)

  `T_DOC_COMMENT` was introduced in PHP 5.

`T_OPEN_TAG` (integer)

`T_OPEN_TAG_WITH_ECHO` (integer)

`T_CLOSE_TAG` (integer)

`T_WHITESPACE` (integer)

`T_START_HEREDOC` (integer)

`T_END_HEREDOC` (integer)

`T_DOLLAR_OPEN_CURLY_BRACES` (integer)

`T_CURLY_OPEN` (integer)

`T_PAAMAYIM_NEKUDOTAYIM` (integer)

`T_DOUBLE_COLON` (integer)

`T_INTERFACE` (integer)

  PHP 5 only.

`T_IMPLEMENTS` (integer)

  PHP 5 only.

`T_CLASS_C` (integer)

  PHP 5 only.

`T_FUNC_C` (integer)

  PHP 5 only.

`T_METHOD_C` (integer)

  PHP 5 only.

`T_ABSTRACT` (integer)

  PHP 5 only.

`T_CATCH` (integer)

  PHP 5 only.

`T_FINAL` (integer)

  PHP 5 only.

`T_INSTANCEOF` (integer)

  PHP 5 only.

`T_PRIVATE` (integer)

  PHP 5 only.

`T_PROTECTED` (integer)

  PHP 5 only.

`T_PUBLIC` (integer)

  PHP 5 only.

`T_THROW` (integer)

  PHP 5 only.

`T_TRY` (integer)

  PHP 5 only.

`T_CLONE` (integer)

  PHP 5 only.

# 範例

Here is a simple example PHP scripts using the tokenizer that will read in a PHP file, strip all comments from the source and print the pure code only.

範例 1. Strip comments with the tokenizer

`<?php
/*
* T_ML_COMMENT does not exist in PHP 5.
* The following three lines define it in order to
* preserve backwards compatibility.
*
* The next two lines define the PHP 5 only T_DOC_COMMENT,
* which we will mask as T_ML_COMMENT for PHP 4.
*/
if (!defined('T_ML_COMMENT')) {
define('T_ML_COMMENT', T_COMMENT);
} else {
define('T_DOC_COMMENT', T_ML_COMMENT);
}
$source = file_get_contents('example.php');
$tokens = token_get_all($source);
foreach ($tokens as $token) {
if (is_string($token)) {
// simple 1-character token
echo $token;
} else {
// token array
list($id, $text) = $token;
switch ($id) {
case T_COMMENT:
case T_ML_COMMENT: // we've defined this
case T_DOC_COMMENT: // and this
// no action on comments
break;
default:
// anything else -> output "as is"
echo $text;
break;
}
}
}
?>`

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