PHP CString::stripStart方法代码示例

 /**
  * Creates a URL path from a path string or as empty.
  *
  * If a source path string is provided, it should start with "/". Just like in any valid URL, the path string is
  * not expected to contain characters that cannot be represented literally and percent-encoding is expected to be
  * used for any such characters. No trailing "/" are stripped off the path string, so if the path is e.g.
  * "/comp0/comp1/", it produces an empty string as the last component.
  *
  * @param  string $path **OPTIONAL. Default is** *create an empty URL path*. A string with the source path.
  */
 public function __construct($path = null)
 {
     assert('!isset($path) || is_cstring($path)', vs(isset($this), get_defined_vars()));
     assert('!isset($path) || CString::startsWith($path, "/")', vs(isset($this), get_defined_vars()));
     if (isset($path)) {
         $path = CString::stripStart($path, "/");
         $this->m_components = CString::split($path, "/");
         $len = CArray::length($this->m_components);
         for ($i = 0; $i < $len; $i++) {
             $this->m_components[$i] = CUrl::leaveTdNew($this->m_components[$i]);
         }
     } else {
         $this->m_components = CArray::make();
     }
 }

 /**
  * Normalizes a path by removing any trailing slashes, any redundant slashes, any references to the current
  * directory, and any references to the parent directory where possible, and returns the new path.
  *
  * For example, "/path//./dir-a/.././to//../dir-b/" is normalized to "/path/dir-b".
  *
  * @param  string $path The path to be normalized (can be absolute or relative).
  * @param  bool $targetIsExecutable **OPTIONAL. Default is** `false`. Tells whether the path's target should be
  * treated as an executable so that, if the path starts with ".", the resulting path will start with "." too and
  * the "." will not be removed as a reference to the current directory.
  *
  * @return CUStringObject The normalized path.
  */
 public static function normalize($path, $targetIsExecutable = false)
 {
     assert('is_cstring($path) && is_bool($targetIsExecutable)', vs(isset($this), get_defined_vars()));
     assert('!CString::isEmpty($path)', vs(isset($this), get_defined_vars()));
     $path = CRegex::replace($path, "/\\/{2,}/", "/");
     // normalize consecutive slashes
     $path = CString::stripEnd($path, "/");
     // remove the trailing slash, if any
     if (CString::isEmpty($path)) {
         return "/";
     }
     $path = CRegex::remove($path, "/\\/\\.(?=\\/|\\z)/");
     // remove any "/." followed by a slash or at the end
     if (CString::isEmpty($path)) {
         return "/";
     }
     if (!$targetIsExecutable) {
         $path = CString::stripStart($path, "./");
     }
     $pathIsAbsolute;
     if (!CString::startsWith($path, "/")) {
         $pathIsAbsolute = false;
     } else {
         $pathIsAbsolute = true;
         $path = CString::substr($path, 1);
     }
     if (!CString::find($path, "/")) {
         if ($pathIsAbsolute) {
             if (!CString::equals($path, "..")) {
                 $path = "/{$path}";
             } else {
                 $path = "/";
             }
         }
         return $path;
     }
     // Recompose the path.
     $components = CString::split($path, "/");
     $newComponents = CArray::make();
     $len = CArray::length($components);
     for ($i = 0; $i < $len; $i++) {
         $comp = $components[$i];
         $lastAddedComp = "";
         $noCompsAddedYet = CArray::isEmpty($newComponents);
         if (!$noCompsAddedYet) {
             $lastAddedComp = CArray::last($newComponents);
         }
         if (CString::equals($comp, "..")) {
             if ($noCompsAddedYet || CString::equals($lastAddedComp, "..") || CString::equals($lastAddedComp, ".")) {
                 if (!($noCompsAddedYet && $pathIsAbsolute)) {
                     CArray::push($newComponents, $comp);
                 }
             } else {
                 CArray::pop($newComponents);
             }
         } else {
             CArray::push($newComponents, $comp);
         }
     }
     $path = CArray::join($newComponents, "/");
     if ($pathIsAbsolute) {
         $path = "/{$path}";
     } else {
         if (CString::isEmpty($path)) {
             $path = ".";
         }
     }
     return $path;
 }

 /**
  * Returns the path to the file of the initially run script, relative to the Document Root directory.
  *
  * @return CUStringObject The path to the file of the initially run script, relative to the Document Root
  * directory.
  */
 public static function initScriptRelFp()
 {
     return CString::stripStart($_SERVER["SCRIPT_NAME"], "/");
 }