Remove whitespace and annotations in PHP code _php tutorial

PHP has a built-in Php_strip_whitespace method for reading php files and removing whitespace and comments from the code, but does not support direct read content removal of whitespace and annotations, and the following method supports reading string content, and the method is built into the thinkphp framework.

/**

* Remove whitespace and comments from the code

* @param string $content code content

* @return String

*/

function Strip_whitespace ($content) {

$STRIPSTR = ";

Analysis of PHP source code

$tokens = Token_get_all ($content);

$last _space = false;

for ($i = 0, $j = count ($tokens); $i < $j; $i + +) {

if (is_string ($tokens [$i])) {

$last _space = false;

$stripStr. = $tokens [$i];

} else {

Switch ($tokens [$i][0]) {

Filter various PHP comments

Case T_comment:

Case T_doc_comment:

Break

Filter spaces

Case T_whitespace:

if (! $last _space) {

$stripStr. = ';

$last _space = true;

}

Break

Case T_start_heredoc:

$stripStr. = "<<

Break

Case T_end_heredoc:

$stripStr. = "think;\n";

for ($k = $i +1; $k < $j; $k + +) {

if (is_string ($tokens [$k]) && $tokens [$k] = = '; ') {

$i = $k;

Break

} else if ($tokens [$k][0] = = T_close_tag) {

Break

}

}

Break

Default

$last _space = false;

$stripStr. = $tokens [$i][1];

}

}

}

return $stripStr;

}

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