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  • fnmatch()

    (PHP 4 >= 4.3.0, PHP 5, PHP 7)

    用模式匹配文件名

    说明

    fnmatch(string $pattern,string $string[,int $flags= 0]): bool

    fnmatch()检查传入的$string是否匹配给出的 shell 统配符$pattern

    参数

    $pattern

    shell 统配符。

    $string

    要检查的字符串。此函数对于文件名尤其有用,但也可以用于普通的字符串。

    普通用户可能习惯于 shell 模式或者至少其中最简单的形式'?''*'通配符,因此使用fnmatch()来代替preg_match()来进行前端搜索表达式输入对于非程序员用户更加方便。

    $flags

    The value of$flagscan be any combination of the following flags, joined with thebinary OR (|) operator.

    A list of possible flags forfnmatch()
    $FlagDescription
    FNM_NOESCAPEDisable backslash escaping.
    FNM_PATHNAMESlash in string only matches slash in the given pattern.
    FNM_PERIODLeading period in string must be exactly matched by period in the given pattern.
    FNM_CASEFOLDCaseless match. Part of the GNU extension.

    返回值

    匹配则返回TRUE,否则返回FALSE

    更新日志

    版本说明
    5.3.0此函数开始在 Windows 平台上生效。

    范例

    用 shell 中的通配符模式匹配来检查颜色名称

    <?php
    if (fnmatch("*gr[ae]y", $color)) {
      echo "some form of gray ...";
    }
    ?>
    

    注释

    Warning

    目前该函数无法在 Windows 或其它非 POSIX 兼容的系统上使用。

    参见

    An addition to my previous note: My statement regarding the FNM_* constants was wrong. They are available on POSIX-compliant systems (in other words, if fnmatch() is defined).
    Here's a definitive solution, which supports negative character classes and the four documented flags.
    <?php
      
      if (!function_exists('fnmatch')) {
        define('FNM_PATHNAME', 1);
        define('FNM_NOESCAPE', 2);
        define('FNM_PERIOD', 4);
        define('FNM_CASEFOLD', 16);
        
        function fnmatch($pattern, $string, $flags = 0) {
          return pcre_fnmatch($pattern, $string, $flags);
        }
      }
      
      function pcre_fnmatch($pattern, $string, $flags = 0) {
        $modifiers = null;
        $transforms = array(
          '\*'  => '.*',
          '\?'  => '.',
          '\[\!'  => '[^',
          '\['  => '[',
          '\]'  => ']',
          '\.'  => '\.',
          '\\'  => '\\\\'
        );
        
        // Forward slash in string must be in pattern:
        if ($flags & FNM_PATHNAME) {
          $transforms['\*'] = '[^/]*';
        }
        
        // Back slash should not be escaped:
        if ($flags & FNM_NOESCAPE) {
          unset($transforms['\\']);
        }
        
        // Perform case insensitive match:
        if ($flags & FNM_CASEFOLD) {
          $modifiers .= 'i';
        }
        
        // Period at start must be the same as pattern:
        if ($flags & FNM_PERIOD) {
          if (strpos($string, '.') === 0 && strpos($pattern, '.') !== 0) return false;
        }
        
        $pattern = '#^'
          . strtr(preg_quote($pattern, '#'), $transforms)
          . '$#'
          . $modifiers;
        
        return (boolean)preg_match($pattern, $string);
      }
      
    ?>
    This probably needs further testing, but it seems to function identically to the native fnmatch implementation.
    There is a problem within the pcre_fnmatch-Function concerning backslashes. Those will be masked by preq_quote and ADDITONALLY by the strtr if FN_NOESCAPE is not set -> something like "*a(*" will finally result in "#^.*a\\(.*$#". Note the double backslash which effectively does NOT mask the "(" correctly.
     
    Since preq_quote always matches a backslash I don't think that this'll work with using preg_quote at all.
    soywiz's function didnt seem to work for me, but this did.
    <?php
    if(!function_exists('fnmatch')) {
      function fnmatch($pattern, $string) {
        return preg_match("#^".strtr(preg_quote($pattern, '#'), array('\*' => '.*', '\?' => '.'))."$#i", $string);
      } // end
    } // end if
    ?>
    
    About the windows compat functions below:
    I needed fnmatch for a application that had to work on Windows, took a look here and tested both. Jk's works for me, soywiz didn't (on WinXPSP2, PHP 5.2.3).
    The only difference between them is addcslashes (soywiz) instead of preg_quote (jk). They _should_ both work, but for some reason soywiz's didn't for me. So YMMV.
    However, to make JK's fnmatch() work with the example in the documentation, you also have to strtr the [ and ] in $pattern.
    <?php
    $pattern = strtr(preg_quote($pattern, '#'), array('\*' => '.*', '\?' => '.', '\[' => '[', '\]' => ']'));
    ?>
    And thanks for the functions, guys.
    soywiz's function still doesn't seem to work -- at least not with PHP 5.2.3 on Windows -- but jk's does.
    you couls also try this function that I wrote before I found fnmatch:
    function WildToReg($str)
    {
     $s = "";  
     for ($i = 0; $i < strlen($str); $i++)
     {
      $c = $str{$i};
      if ($c =='?')
      $s .= '.'; // any character
      else if ($c == '*')  
      $s .= '.*'; // 0 or more any characters  
      else if ($c == '[' || $c == ']')
      $s .= $c; // one of characters within []
      else
      $s .= '\\' . $c;
     }
     $s = '^' . $s . '$';
     //trim redundant ^ or $
     //eg ^.*\.txt$ matches exactly the same as \.txt$
     if (substr($s,0,3) == "^.*")
      $s = substr($s,3);
     if (substr($s,-3,3) == ".*$")
      $s = substr($s,0,-3);
     return $s;
    }
    if (ereg(WildToReg("*.txt"), $fn))
     print "$fn is a text file";
    else
     print "$fn is not a text file";
    Possible flags (scratched out of fnmatch.h):
    ...::...
    FNM_PATHNAME:
    > Slash in $string only matches slash in $pattern.
    FNM_PERIOD:
    > Leading period in $string must be exactly matched by period in $pattern.
    FNM_NOESCAPE:
    > Disable backslash escaping.
    FNM_NOSYS:
    > Obsolescent.
    FNM_FILE_NAME:
    > Alias of FNM_PATHNAME.
    FNM_LEADING_DIR:
    > From fnmatch.h: /* Ignore `/...' after a match. */
    FNM_CASEFOLD:
    > Caseless match.
    Since they’re appearing in file.c, but are not available in PHP, we’ll have to define them ourselves:
    <?php
    define('FNM_PATHNAME', 1);
    define('FNM_PERIOD', 4);
    define('FNM_NOESCAPE', 2);
    // GNU extensions
    define('FNM_FILE_NAME', FNM_PATHNAME);
    define('FNM_LEADING_DIR', 8);
    define('FNM_CASEFOLD', 16);
    ?>
    I didn’t test any of these except casefold, which worked for me.
    fnmatch is not 100% reliable. Bug 14185 is still open and may or may not have been patched.
    In certain wildcard circumstance fnmatch("*needle*", $haystack, match) returns false intermittantly
    However stripos or preg returns a "find".

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