©
Ce document utilise Manuel du site Web PHP chinois Libérer
(PHP 5 <= 5.0.4)
php_check_syntax — 检查PHP的语法(并执行)指定的文件
$filename
[, string &$error_message
] )
对指定的 filename
进行语法检查,检测脚本的错误。
此函数除了会执行(但不会输出)filename
,其他与 命令行中使用php -l 相似。
例如,如果函数在文件 filename
中被定义了,则该函数在执行 php_check_syntax() 后可用。但是filename
输出内容不会被输出。
Note:
因为某些技术原因,该函数已被弃用,并且从PHP中移除了。请以commandline使用 php -l somefile.php取而代之。
filename
需要被检测的文件。
error_message
如果使用了参数 error_message
,它会包含语法检测出的错误信息。
error_message
以 引用方式传递。
如果语法检测通过返回 TRUE
,未通过或者文件无法打开则返回 FALSE
。
版本 | 说明 |
---|---|
5.0.5 | 函数从PHP中移除。 |
5.0.3 | php_check_syntax() 之后调用 exit() 会导致一个段错误。 |
5.0.1 | error_message 通过引用传递
|
php -l somefile.php
以上例程的输出类似于:
PHP Parse error: unexpected T_STRING in /tmp/somefile.php on line 81
[#1] steve at clickforseo dot com [2015-03-05 12:58:23]
On php syntax checking, a blog that supports a tool I like may be useful as it looks at remote php checking https://jresponse.net/blog/remote-php-syntax-checking-incron/
[#2] kevin at metalaxe dot com [2008-12-19 16:37:58]
I've given it some thought and rewritten my function to take full advantage of the CLI -l option (that's lower L). It requires that you enable error reporting via your own php.ini file (which you should edit the function to apply) otherwise the return result is a worthless "Error parsing".
Anyway, I hope this is useful for someone. I'm sure it could use improvement, so use at your own risk. Demo here:
http://kevinpeno.com/projects/php_syntax_check.php
<?php
";
function php_check_syntax( $php, $isFile=false )
{
# Get the string tokens
$tokens = token_get_all( '<?php '.trim( $php ));
# Drop our manually entered opening tag
array_shift( $tokens );
token_fix( $tokens );
# Check to see how we need to proceed
# prepare the string for parsing
if( isset( $tokens[0][0] ) && $tokens[0][0] === T_OPEN_TAG )
$evalStr = $php;
else
$evalStr = "<?php\n{$php}?>
if( $isFile OR ( $tf = tempnam( NULL, 'parse-' ) AND file_put_contents( $tf, $php ) !== FALSE ) AND $tf = $php )
{
# Prevent output
ob_start();
system( 'C:\inetpub\PHP\5.2.6\php -c "'.dirname(__FILE__).'/php.ini" -l < '.$php, $ret );
$output = ob_get_clean();
if( $ret !== 0 )
{
# Parse error to report?
if( (bool)preg_match( '/Parse error:\s*syntax error,(.+?)\s+in\s+.+?\s*line\s+(\d+)/', $output, $match ) )
{
return array(
'line' => (int)$match[2],
'msg' => $match[1]
);
}
}
return true;
}
return false;
}
//fixes related bugs: 29761, 34782 => token_get_all returns
<?php NOT as T_OPEN_TAG
function token_fix( &$tokens ) {
if (!is_array($tokens) || (count($tokens)<2)) {
return;
}
//return of no fixing needed
if (is_array($tokens[0]) && (($tokens[0][0]==T_OPEN_TAG) || ($tokens[0][0]==T_OPEN_TAG_WITH_ECHO)) ) {
return;
}
//continue
$p1 = (is_array($tokens[0])?$tokens[0][1]:$tokens[0]);
$p2 = (is_array($tokens[1])?$tokens[1][1]:$tokens[1]);
$p3 = '';
if (($p1.$p2 == '<?') || ($p1.$p2 == '<%')) {
$type = ($p2=='?')?T_OPEN_TAG:T_OPEN_TAG_WITH_ECHO;
$del = 2;
//update token type for 3rd part?
if (count($tokens)>2) {
$p3 = is_array($tokens[2])?$tokens[2][1]:$tokens[2];
$del = (($p3=='php') || ($p3=='='))?3:2;
$type = ($p3=='=')?T_OPEN_TAG_WITH_ECHO:$type;
}
//rebuild erroneous token
$temp = array($type, $p1.$p2.$p3);
if (version_compare(phpversion(), '5.2.2', '<' )===false)
$temp[] = isset($tokens[0][2])?$tokens[0][2]:'unknown';
//rebuild
$tokens[1] = '';
if ($del==3) $tokens[2]='';
$tokens[0] = $temp;
}
return;
}
?>
[#3] nicolas dot grekas+php at gmail dot com [2008-10-20 13:20:20]
Hi again, here is my last contribution to the subject : this php_syntax_error() function returns false if there is no syntax error in $code, or an array($message, $line) if there is one (idea borrowed from kevin's code) .
For exemple, php_syntax_error(' DELIBERTE PHP ERROR; ') returns array('unexpected T_STRING', 1) ;)
Please note that the dead code sandbox IS important. A "return" at the beginning of the evaluated string can easily be broken: try eval('return; function strlen(){}') versus eval('if(0){function strlen(){}}').
<?php
function php_syntax_error($code)
{
$braces = 0;
$inString = 0;
// First of all, we need to know if braces are correctly balanced.
// This is not trivial due to variable interpolation which
// occurs in heredoc, backticked and double quoted strings
foreach (token_get_all('<?php ' . $code) as $token)
{
if (is_array($token))
{
switch ($token[0])
{
case T_CURLY_OPEN:
case T_DOLLAR_OPEN_CURLY_BRACES:
case T_START_HEREDOC: ++$inString; break;
case T_END_HEREDOC: --$inString; break;
}
}
else if ($inString & 1)
{
switch ($token)
{
case '`':
case '"': --$inString; break;
}
}
else
{
switch ($token)
{
case '`':
case '"': ++$inString; break;
case '{': ++$braces; break;
case '}':
if ($inString) --$inString;
else
{
--$braces;
if ($braces < 0) break 2;
}
break;
}
}
}
// Display parse error messages and use output buffering to catch them
$inString = @ini_set('log_errors', false);
$token = @ini_set('display_errors', true);
ob_start();
// If $braces is not zero, then we are sure that $code is broken.
// We run it anyway in order to catch the error message and line number.
// Else, if $braces are correctly balanced, then we can safely put
// $code in a dead code sandbox to prevent its execution.
// Note that without this sandbox, a function or class declaration inside
// $code could throw a "Cannot redeclare" fatal error.
$braces || $code = "if(0){{$code}\n}";
if (false === eval($code))
{
if ($braces) $braces = PHP_INT_MAX;
else
{
// Get the maximum number of lines in $code to fix a border case
false !== strpos($code, "\r") && $code = strtr(str_replace("\r\n", "\n", $code), "\r", "\n");
$braces = substr_count($code, "\n");
}
$code = ob_get_clean();
$code = strip_tags($code);
// Get the error message and line number
if (preg_match("'syntax error, (.+) in .+ on line (\d+)$'s", $code, $code))
{
$code[2] = (int) $code[2];
$code = $code[2] <= $braces
? array($code[1], $code[2])
: array('unexpected $end' . substr($code[1], 14), $braces);
}
else $code = array('syntax error', 0);
}
else
{
ob_end_clean();
$code = false;
}
@ini_set('display_errors', $token);
@ini_set('log_errors', $inString);
return $code;
}
?>
[#4] matt dot nospam at pryor dot org dot uk [2008-02-05 05:35:55]
While developing an app where I have to include PHP files written by a user, I came across the following problem:
I used "php -l somefile.php" to check the syntax of the file I was about to include and if it passed, I would include it - so far so good. But in some test cases, the file I was including would have other includes/requires inside it. If one of these was invalid, then I would still get the parse error that I was trying to avoid.
I got round it using this:
<?php
function CheckSyntax($fileName, $checkIncludes = true)
{
// If it is not a file or we can't read it throw an exception
if(!is_file($fileName) || !is_readable($fileName))
throw new Exception("Cannot read file ".$fileName);
// Sort out the formatting of the filename
$fileName = realpath($fileName);
// Get the shell output from the syntax check command
$output = shell_exec('php -l "'.$fileName.'"');
// Try to find the parse error text and chop it off
$syntaxError = preg_replace("/Errors parsing.*$/", "", $output, -1, $count);
// If the error text above was matched, throw an exception containing the syntax error
if($count > 0)
throw new Exception(trim($syntaxError));
// If we are going to check the files includes
if($checkIncludes)
{
foreach(GetIncludes($fileName) as $include)
{
// Check the syntax for each include
CheckSyntax($include);
}
}
}
function GetIncludes($fileName)
{
// NOTE that any file coming into this function has already passed the syntax check, so
// we can assume things like proper line terminations
$includes = array();
// Get the directory name of the file so we can prepend it to relative paths
$dir = dirname($fileName);
// Split the contents of $fileName about requires and includes
// We need to slice off the first element since that is the text up to the first include/require
$requireSplit = array_slice(preg_split('/require|include/i', file_get_contents($fileName)), 1);
// For each match
foreach($requireSplit as $string)
{
// Substring up to the end of the first line, i.e. the line that the require is on
$string = substr($string, 0, strpos($string, ";"));
// If the line contains a reference to a variable, then we cannot analyse it
// so skip this iteration
if(strpos($string, "$") !== false)
continue;
// Split the string about single and double quotes
$quoteSplit = preg_split('/[\'"]/', $string);
// The value of the include is the second element of the array
// Putting this in an if statement enforces the presence of '' or "" somewhere in the include
// includes with any kind of run-time variable in have been excluded earlier
// this just leaves includes with constants in, which we can't do much about
if($include = $quoteSplit[1])
{
// If the path is not absolute, add the dir and separator
// Then call realpath to chop out extra separators
if(strpos($include, ':') === FALSE)
$include = realpath($dir.DIRECTORY_SEPARATOR.$include);
array_push($includes, $include);
}
}
return $includes;
}
?>
This checks as many of the includes inside the file as it possibly can without executing anything.
[#5] nicolas dot grekas+php at gmail dot com [2008-01-25 10:16:52]
My previous code was buggy sorry, here is an update (thanks phprockstheworld). I can't find a way to break the dead code sandbox. Who can ?
<?php
function eval_syntax($code)
{
$braces = 0;
$inString = 0;
// We need to know if braces are correctly balanced.
// This is not trivial due to variable interpolation
// which occurs in heredoc, backticked and double quoted strings
foreach (token_get_all('<?php ' . $code) as $token)
{
if (is_array($token))
{
switch ($token[0])
{
case T_CURLY_OPEN:
case T_DOLLAR_OPEN_CURLY_BRACES:
case T_START_HEREDOC: ++$inString; break;
case T_END_HEREDOC: --$inString; break;
}
}
else if ($inString & 1)
{
switch ($token)
{
case '`':
case '"': --$inString; break;
}
}
else
{
switch ($token)
{
case '`':
case '"': ++$inString; break;
case '{': ++$braces; break;
case '}':
if ($inString) --$inString;
else
{
--$braces;
if ($braces < 0) return false;
}
break;
}
}
}
if ($braces) return false; // Unbalanced braces would break the eval below
else
{
ob_start(); // Catch potential parse error messages
$code = eval('if(0){' . $code . '}'); // Put $code in a dead code sandbox to prevent its execution
ob_end_clean();
return false !== $code;
}
}