php_strip_whitespace

(PHP 5, PHP 7, PHP 8)

php_strip_whitespace — 返回删除注释和空格后的PHP源码

说明

php_strip_whitespace(string $filename): string

返回删除注释和空格后 filename 的PHP源码。这对实际代码数量和注释数量的对比很有用。此函数与命令行下执行 php -w 相似。

参数

filename: PHP文件的路径。

返回值

在成功时返回过滤后的代码，或者在失败时返回空字符串。

注意:
此函数遵守 short_open_tag ini 指令的值。

示例

示例 #1 php_strip_whitespace() 的例子

<?php
// PHP comment here

/*
 * Another PHP comment
 */

echo        php_strip_whitespace(__FILE__);
// Newlines are considered whitespace, and are removed too:
do_nothing();
?>

以上示例会输出：

<?php
 echo php_strip_whitespace(__FILE__); do_nothing(); ?>

可以注意到PHP的注释已不存在，成为第一个echo语句前的换行和空格。

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＋添加备注

用户贡献的备注 5 notes

down

gelamu at gmail dot com ¶

16 years ago

With this function You can compress Your PHP source code.

<?php

function compress_php_src($src) {
    // Whitespaces left and right from this signs can be ignored
    static $IW = array(
        T_CONCAT_EQUAL,             // .=
        T_DOUBLE_ARROW,             // =>
        T_BOOLEAN_AND,              // &&
        T_BOOLEAN_OR,               // ||
        T_IS_EQUAL,                 // ==
        T_IS_NOT_EQUAL,             // != or <>
        T_IS_SMALLER_OR_EQUAL,      // <=
        T_IS_GREATER_OR_EQUAL,      // >=
        T_INC,                      // ++
        T_DEC,                      // --
        T_PLUS_EQUAL,               // +=
        T_MINUS_EQUAL,              // -=
        T_MUL_EQUAL,                // *=
        T_DIV_EQUAL,                // /=
        T_IS_IDENTICAL,             // ===
        T_IS_NOT_IDENTICAL,         // !==
        T_DOUBLE_COLON,             // ::
        T_PAAMAYIM_NEKUDOTAYIM,     // ::
        T_OBJECT_OPERATOR,          // ->
        T_DOLLAR_OPEN_CURLY_BRACES, // ${
        T_AND_EQUAL,                // &=
        T_MOD_EQUAL,                // %=
        T_XOR_EQUAL,                // ^=
        T_OR_EQUAL,                 // |=
        T_SL,                       // <<
        T_SR,                       // >>
        T_SL_EQUAL,                 // <<=
        T_SR_EQUAL,                 // >>=
    );
    if(is_file($src)) {
        if(!$src = file_get_contents($src)) {
            return false;
        }
    }
    $tokens = token_get_all($src);
    
    $new = "";
    $c = sizeof($tokens);
    $iw = false; // ignore whitespace
    $ih = false; // in HEREDOC
    $ls = "";    // last sign
    $ot = null;  // open tag
    for($i = 0; $i < $c; $i++) {
        $token = $tokens[$i];
        if(is_array($token)) {
            list($tn, $ts) = $token; // tokens: number, string, line
            $tname = token_name($tn);
            if($tn == T_INLINE_HTML) {
                $new .= $ts;
                $iw = false;
            } else {
                if($tn == T_OPEN_TAG) {
                    if(strpos($ts, " ") || strpos($ts, "\n") || strpos($ts, "\t") || strpos($ts, "\r")) {
                        $ts = rtrim($ts);
                    }
                    $ts .= " ";
                    $new .= $ts;
                    $ot = T_OPEN_TAG;
                    $iw = true;
                } elseif($tn == T_OPEN_TAG_WITH_ECHO) {
                    $new .= $ts;
                    $ot = T_OPEN_TAG_WITH_ECHO;
                    $iw = true;
                } elseif($tn == T_CLOSE_TAG) {
                    if($ot == T_OPEN_TAG_WITH_ECHO) {
                        $new = rtrim($new, "; ");
                    } else {
                        $ts = " ".$ts;
                    }
                    $new .= $ts;
                    $ot = null;
                    $iw = false;
                } elseif(in_array($tn, $IW)) {
                    $new .= $ts;
                    $iw = true;
                } elseif($tn == T_CONSTANT_ENCAPSED_STRING
                       || $tn == T_ENCAPSED_AND_WHITESPACE)
                {
                    if($ts[0] == '"') {
                        $ts = addcslashes($ts, "\n\t\r");
                    }
                    $new .= $ts;
                    $iw = true;
                } elseif($tn == T_WHITESPACE) {
                    $nt = @$tokens[$i+1];
                    if(!$iw && (!is_string($nt) || $nt == '$') && !in_array($nt[0], $IW)) {
                        $new .= " ";
                    }
                    $iw = false;
                } elseif($tn == T_START_HEREDOC) {
                    $new .= "<<<S\n";
                    $iw = false;
                    $ih = true; // in HEREDOC
                } elseif($tn == T_END_HEREDOC) {
                    $new .= "S;";
                    $iw = true;
                    $ih = false; // in HEREDOC
                    for($j = $i+1; $j < $c; $j++) {
                        if(is_string($tokens[$j]) && $tokens[$j] == ";") {
                            $i = $j;
                            break;
                        } else if($tokens[$j][0] == T_CLOSE_TAG) {
                            break;
                        }
                    }
                } elseif($tn == T_COMMENT || $tn == T_DOC_COMMENT) {
                    $iw = true;
                } else {
                    if(!$ih) {
                        $ts = strtolower($ts);
                    }
                    $new .= $ts;
                    $iw = false;
                }
            }
            $ls = "";
        } else {
            if(($token != ";" && $token != ":") || $ls != $token) {
                $new .= $token;
                $ls = $token;
            }
            $iw = true;
        }
    }
    return $new;
}

?>

For example:
<?php

$src = <<<EOT
<?php
// some comment
for ( $i = 0; $i < 99; $i ++ ) {
   echo "i=${ i }\n";
   /* ... */
}
/** ... */
function abc() {
   return   "abc";
};

abc();
?>
<h1><?= "Some text " . str_repeat("_-x-_ ", 32);;; ?></h1>
EOT;
var_dump(compress_php_src($src));
?>

And the result is:
string(125) "<?php for(=0;<99;++){echo "i=\n";}function abc(){return "abc";};abc(); ?>
<h1><?="Some text ".str_repeat("_-x-_ ",32)?></h1>"

down

Jouni ¶

17 years ago

If you wish to just remove excess whitespace from a string, see the example "Strip whitespace" in the preg_replace documentation (http://www.php.net/manual/en/function.preg-replace.php).

down

razvan_bc at yahoo dot com ¶

5 years ago

i notice that on 45=75kb php file compressed using php_strip_whitespace i got slowest speed results in my apache benchmark  .bat tests so doing on a normal php file 10 tests and another 10 tests on a compressed one ,calculating the math average value  I got fastest results on  normal php files.

well,seeing that results i think  SO ,NICE,BUT IF WE COMBINE THESE "METHODS" : what if i use a partial minified method using this function ????

here is the code:
(if you run this in xampp and you are beginner you got a blank page in firefox  ,but if you right click it then you click on the option "view source" you'll get the php partial stripped by comments and tabs) :

<?php
/*   hi there !!!
here are the comments */
//another try

echo removecomments('index.php');

/*   hi there !!!
here are the comments */
//another try
function removecomments($f){
    $w=Array(';','{','}');
    $ts = token_get_all(php_strip_whitespace($f));
    $s='';
    foreach($ts as $t){
        if(is_array($t)){
            $s .=$t[1];
        }else{
            $s .=$t;
            if( in_array($t,$w) ) $s.=chr(13).chr(10);
        }
    }

    return $s;
}

?>

down

flconseil at yahoo dot fr ¶

18 years ago

Beware that this function uses the output buffering mechanism.

If you give a 'stream wrapped' path as argument, anything echoed by the stream wrapper during this call (e.g. trace messages) won't be displayed to the screen but will be inserted in php_strip_whitespace's result.

If you execute this stripped code later, it will display the messages which should have been output during php_strip_whitespace's execution !

down

-2

TK ¶

15 years ago

I was looking earlier for a way to strip php comments from my source files but didn't come up with much.  I wrote the following function to do the trick using the tokenizer.  I've tested in on an entire phpMyAdmin install and it worked fine afterward... so it should be good to go.  You may also specify any number of tokens to strip such as T_WHITESPACE rather the default of T_COMMENT and T_DOC_COMMENT.

Hopefully someone finds it useful.

<?php

function strip_tokens($code) {

    $args = func_get_args();
    $arg_count = count($args);
    
    // if no tokens to strip have been specified then strip comments by default
    if( $arg_count === 1 ) {
        $args[1] = T_COMMENT;
        $args[2] = T_DOC_COMMENT;
    }

    // build a keyed array of tokens to strip
    for( $i = 1; $i < $arg_count; ++$i )
        $strip[ $args[$i] ] = true;

    // set a keyed array of newline characters used to preserve line numbering
    $newlines = array("\n" => true, "\r" => true);

    $tokens = token_get_all($code);

    reset($tokens);

    $return = '';

    $token = current($tokens);
    
    while( $token ) {

        if( !is_array($token) )

            $return.= $token;

        elseif(    !isset($strip[ $token[0] ]) )

            $return.= $token[1];

        else {
            
            // return only the token's newline characters to preserve line numbering
            for( $i = 0, $token_length = strlen($token[1]); $i < $token_length; ++$i )
                if( isset($newlines[ $token[1][$i] ]) )
                    $return.= $token[1][$i];

        }

        $token = next($tokens);

    } // while more tokens

    return $return;

} // function

?>