How to handle multiple file upload using PHP

Question

I want to upload files using PHP but the problem is that I don\'t know how many files I will upload.

My question is how can I upload files if I use file[]

Answer 1

Ajax js

(function(){

var d = document, w = window;

/**
 * Get element by id
 */   
function get(element){
  if (typeof element == "string")
      element = d.getElementById(element);
  return element;
}

/**
 * Attaches event to a dom element
 */
function addEvent(el, type, fn){
  if (w.addEventListener){
      el.addEventListener(type, fn, false);
  } else if (w.attachEvent){
      var f = function(){
        fn.call(el, w.event);
      };          
      el.attachEvent('on' + type, f)
  }
}


/**
 * Creates and returns element from html chunk
 */
var toElement = function(){
  var div = d.createElement('div');
  return function(html){
      div.innerHTML = html;
      var el = div.childNodes[0];
      div.removeChild(el);
      return el;
  }
}();

function hasClass(ele,cls){
  return ele.className.match(new RegExp('(\\s|^)'+cls+'(\\s|$)'));
}
function addClass(ele,cls) {
  if (!hasClass(ele,cls)) ele.className += " "+cls;
}
function removeClass(ele,cls) {
  var reg = new RegExp('(\\s|^)'+cls+'(\\s|$)');
  ele.className=ele.className.replace(reg,' ');
}


if (document.documentElement["getBoundingClientRect"]){

  var getOffset = function(el){
      var box = el.getBoundingClientRect(),
      doc = el.ownerDocument,
      body = doc.body,
      docElem = doc.documentElement,

      // for ie 
      clientTop = docElem.clientTop || body.clientTop || 0,
      clientLeft = docElem.clientLeft || body.clientLeft || 0,

      // In Internet Explorer 7 getBoundingClientRect property is treated as physical,
      // while others are logical. Make all logical, like in IE8.


      zoom = 1;
      if (body.getBoundingClientRect) {
          var bound = body.getBoundingClientRect();
          zoom = (bound.right - bound.left)/body.clientWidth;
      }
      if (zoom > 1){
          clientTop = 0;
          clientLeft = 0;
      }
      var top = box.top/zoom + (window.pageYOffset || docElem && docElem.scrollTop/zoom || body.scrollTop/zoom) - clientTop,
      left = box.left/zoom + (window.pageXOffset|| docElem && docElem.scrollLeft/zoom || body.scrollLeft/zoom) - clientLeft;

      return {
          top: top,
          left: left
      };
  }

} else {
  // Get offset adding all offsets 
  var getOffset = function(el){
      if (w.jQuery){
          return jQuery(el).offset();
      }       

      var top = 0, left = 0;
      do {
          top += el.offsetTop || 0;
          left += el.offsetLeft || 0;
      }
      while (el = el.offsetParent);

      return {
          left: left,
          top: top
      };
  }
}

function getBox(el){
  var left, right, top, bottom;   
  var offset = getOffset(el);
  left = offset.left;
  top = offset.top;

  right = left + el.offsetWidth;
  bottom = top + el.offsetHeight;     

  return {
      left: left,
      right: right,
      top: top,
      bottom: bottom
  };
}

/**
 * Crossbrowser mouse coordinates
 */
function getMouseCoords(e){       

  if (!e.pageX && e.clientX){
      // In Internet Explorer 7 some properties (mouse coordinates) are treated as physical,
      // while others are logical (offset).
      var zoom = 1;   
      var body = document.body;

      if (body.getBoundingClientRect) {
          var bound = body.getBoundingClientRect();
          zoom = (bound.right - bound.left)/body.clientWidth;
      }

      return {
          x: e.clientX / zoom + d.body.scrollLeft + d.documentElement.scrollLeft,
          y: e.clientY / zoom + d.body.scrollTop + d.documentElement.scrollTop
      };
  }

  return {
      x: e.pageX,
      y: e.pageY
  };      

}
/**
 * Function generates unique id
 */       
var getUID = function(){
  var id = 0;
  return function(){
      return 'ValumsAjaxUpload' + id++;
  }
}();

function fileFromPath(file){
  return file.replace(/.*(\/|\\)/, "");           
}

function getExt(file){
  return (/[.]/.exec(file)) ? /[^.]+$/.exec(file.toLowerCase()) : '';
}         

// Please use AjaxUpload , Ajax_upload will be removed in the next version
Ajax_upload = AjaxUpload = function(button, options){
  if (button.jquery){
      // jquery object was passed
      button = button[0];
  } else if (typeof button == "string" && /^#.*/.test(button)){                   
      button = button.slice(1);               
  }
  button = get(button);   

  this._input = null;
  this._button = button;
  this._disabled = false;
  this._submitting = false;
  // Variable changes to true if the button was clicked
  // 3 seconds ago (requred to fix Safari on Mac error)
  this._justClicked = false;
  this._parentDialog = d.body;

  if (window.jQuery && jQuery.ui && jQuery.ui.dialog){
      var parentDialog = jQuery(this._button).parents('.ui-dialog');
      if (parentDialog.length){
          this._parentDialog = parentDialog[0];
      }
  }           

  this._settings = {
      // Location of the server-side upload script
      action: 'upload.php',           
      // File upload name
      name: 'userfile',
      // Additional data to send
      data: {},
      // Submit file as soon as it's selected
      autoSubmit: true,
      // The type of data that you're expecting back from the server.
      // Html and xml are detected automatically.
      // Only useful when you are using json data as a response.
      // Set to "json" in that case. 
      responseType: false,
      // When user selects a file, useful with autoSubmit disabled            
      onChange: function(file, extension){},                  
      // Callback to fire before file is uploaded
      // You can return false to cancel upload
      onSubmit: function(file, extension){},
      // Fired when file upload is completed
      // WARNING! DO NOT USE "FALSE" STRING AS A RESPONSE!
      onComplete: function(file, response) {}
  };

  // Merge the users options with our defaults
  for (var i in options) {
      this._settings[i] = options[i];
  }

  this._createInput();
  this._rerouteClicks();
}

// assigning methods to our class
AjaxUpload.prototype = {
  setData : function(data){
      this._settings.data = data;
  },
  disable : function(){
      this._disabled = true;
  },
  enable : function(){
      this._disabled = false;
  },
  // removes ajaxupload
  destroy : function(){
      if(this._input){
          if(this._input.parentNode){
              this._input.parentNode.removeChild(this._input);
          }
          this._input = null;
      }
  },              
  /**
   * Creates invisible file input above the button 
   */
  _createInput : function(){
      var self = this;
      var input = d.createElement("input");
      input.setAttribute('type', 'file');
      input.setAttribute('name', this._settings.name);
      var styles = {
          'position' : 'absolute'
          ,'margin': '-5px 0 0 -175px'
          ,'padding': 0
          ,'width': '220px'
          ,'height': '30px'
          ,'fontSize': '14px'                             
          ,'opacity': 0
          ,'cursor': 'pointer'
          ,'display' : 'none'
          ,'zIndex' :  2147483583 //Max zIndex supported by Opera 9.0-9.2x 
          // Strange, I expected 2147483647                   
      };
      for (var i in styles){
          input.style[i] = styles[i];
      }

      // Make sure that element opacity exists
      // (IE uses filter instead)
      if ( ! (input.style.opacity === "0")){
          input.style.filter = "alpha(opacity=0)";
      }

      this._parentDialog.appendChild(input);

      addEvent(input, 'change', function(){
          // get filename from input
          var file = fileFromPath(this.value);    
          if(self._settings.onChange.call(self, file, getExt(file)) == false ){
              return;             
          }                                                       
          // Submit form when value is changed
          if (self._settings.autoSubmit){
              self.submit();                      
          }                       
      });

      // Fixing problem with Safari
      // The problem is that if you leave input before the file select dialog opens
      // it does not upload the file.
      // As dialog opens slowly (it is a sheet dialog which takes some time to open)
      // there is some time while you can leave the button.
      // So we should not change display to none immediately
      addEvent(input, 'click', function(){
          self.justClicked = true;
          setTimeout(function(){
              // we will wait 3 seconds for dialog to open
              self.justClicked = false;
          }, 3000);           
      });     

      this._input = input;
  },
  _rerouteClicks : function (){
      var self = this;

      // IE displays 'access denied' error when using this method
      // other browsers just ignore click()
      // addEvent(this._button, 'click', function(e){
      //   self._input.click();
      // });

      var box, dialogOffset = {top:0, left:0}, over = false;                          
      addEvent(self._button, 'mouseover', function(e){
          if (!self._input || over) return;
          over = true;
          box = getBox(self._button);

          if (self._parentDialog != d.body){
              dialogOffset = getOffset(self._parentDialog);
          }   
      });


      // we can't use mouseout on the button,
      // because invisible input is over it
      addEvent(document, 'mousemove', function(e){
          var input = self._input;            
          if (!input || !over) return;

          if (self._disabled){
              removeClass(self._button, 'hover');
              input.style.display = 'none';
              return;
          }   

          var c = getMouseCoords(e);

          if ((c.x >= box.left) && (c.x <= box.right) && 
          (c.y >= box.top) && (c.y <= box.bottom)){           
              input.style.top = c.y - dialogOffset.top + 'px';
              input.style.left = c.x - dialogOffset.left + 'px';
              input.style.display = 'block';
              addClass(self._button, 'hover');                
          } else {        
              // mouse left the button
              over = false;
              if (!self.justClicked){
                  input.style.display = 'none';
              }
              removeClass(self._button, 'hover');
          }           
      });         

  },
  /**
   * Creates iframe with unique name
   */
  _createIframe : function(){
      // unique name
      // We cannot use getTime, because it sometimes return
      // same value in safari :(
      var id = getUID();


      var iframe = toElement('