Home >Backend Development >PHP Tutorial >PHP function to remove comments and spaces
Although the php_strip_whitespace method in php5 can return the PHP source code after removing comments and spaces, for the sake of learning, here is a method of your own that can also remove blanks and comments in the code. The code is as follows:
PHP5 built-in function:
//返回删除注释和空格后的PHP源码 php_strip_whitespace()
Example:
<?php // PHP comment here /* * Another PHP comment */ echo php_strip_whitespace(__FILE__); //Newlines are considered whitespace, and are removed too: do_nothing(); ?>
Custom function:
/** * 去除代码中的空白和注释 * @param string $content 代码内容 * @return string */ function strip_whitespace($content) { $stripStr = ''; //分析php源码 $tokens = token_get_all($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]) { //过滤各种PHP注释 case T_COMMENT: case T_DOC_COMMENT: break; //过滤空格 case T_WHITESPACE: if (!$last_space) { $stripStr .= ' '; $last_space = true; } break; case T_START_HEREDOC: $stripStr .= "<<<THINK\n"; 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; }