PHP 8.1.28 Released!

php_strip_whitespace

(PHP 5, PHP 7, PHP 8)

php_strip_whitespaceRetorna o código com comentários e espaços em branco removidos

Descrição

php_strip_whitespace(string $filename): string

Retorna o código-fonte do PHP do arquivo filename com comentários PHP e espaços em branco removidos. Isto pode ser útil para determina a quantidade atual de códigos em seu script comparado com a quantidade de comentários. Similar ao uso de php -w pela linha de comando.

Parâmetros

filename

Caminho para o arquivo PHP.

Valor Retornado

O código-fonte filtrado será retornado em caso de sucesso, ou uma string vazia em falha.

Nota:

Esta função respeita o valor da diretiva ini short_open_tag.

Exemplos

Exemplo #1 Exemplo de php_strip_whitespace()

<?php
// Comentário do PHP aqui

/*
* Outro comentário do PHP
*/

echo php_strip_whitespace(__FILE__);
// Novas linhas são consideradas espaço em branco, e também são removidas:
do_nothing();
?>

O exemplo acima produzirá:

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

Note que os comentários do PHP foram removidos, assim como os espaços em branco e caracteres de novas linhas depois da primeira declaração echo.

add a note

User Contributed Notes 5 notes

up
15
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>"
up
6
Jouni
16 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).
up
2
flconseil at yahoo dot fr
17 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 !
up
1
razvan_bc at yahoo dot com
4 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;
}

?>
up
-3
TK
14 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

?>
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