How does PHP implement decompression package files to the specified directory? (pure Code)

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$SRC _file is the file path, the upload file returns the compressed package path to public function unzip ($src _file, $dest _dir=false, $create _zip_name_dir=true, $        Overwrite=true) {$filePath _arr = []; if ($zip = Zip_open ($src _file)) {if ($zip) {$splitter = ($create _zip_name_dir = = = True)?                "." : "/"; if ($dest _dir = = = False) {$dest _dir = substr ($src _file, 0, Strrpos ($src _file, $splitter)). "                /";                }//If there is no create target extract directory $this->create_dirs ($dest _dir); Unzip each file while ($zip _entry = Zip_read ($zip)) {//The file is not in the root directory $pos _las                    T_slash = Strrpos (Zip_entry_name ($zip _entry), "/"); if ($pos _last_slash!== false) {//Create directory at end with/$this->create_dirs ($dest _d                    Ir.substr (Zip_entry_name ($zip _entry), 0, $pos _last_slash+1)); }//Open Package if (Zip_entry_open ($zip, $zip _Entry, "R")) {//file name is saved on disk $file _name = $dest _dir.zip_entry_name ($zip _entry); Check if the file needs to be rewritten if ($overwrite = = = True | | $overwrite = = = False &&!i S_file ($file _name)) {//reads the contents of the compressed file $fstream = Zip_entry_read ($zip _ent                            Ry, Zip_entry_filesize ($zip _entry));                            @file_put_contents ($file _name, $fstream);                            Set Permissions chmod ($file _name, 0777); echo "Save:". $file _name. "                        <br/> ";                    }//Close the entrance zip_entry_close ($zip _entry);            }}//Close compressed package zip_close ($zip);        }}else{return false;  } return $filePath _arr; Returns all file paths after compression}/** * Create directory */Public function create_dirs ($path{if (!is_dir ($path)) {$directory _path = "";            $directories = Explode ("/", $path);            Array_pop ($directories); foreach ($directories as $directory) {$directory _path. = $directory. "                /";                    if (!is_dir ($directory _path)) {mkdir ($directory _path);                chmod ($directory _path, 0777); }            }        }    }