用POST方法上傳文件

文件上傳分為客戶端和服務器端

客戶端可以通過form表單進行上傳

客戶端使用html表單進行上傳
enctype = "multipart/form-data"用來指定表單編碼數據方式
method = "POST"指明發送數據的方法
<form action = "upload.php" method = "POST" enctype = "multipart/form-data">
<input type = "hidden" name = "MAXN_FILIE_SIZE" value = "100000">
選擇文件：<input type = "file" name = "myFile">
<input type = "submit" value = "上傳文件">
</form>

最主要的就是type="file"的<input>標簽

服務器端

<!--
    簡單的文件上傳的PHP腳本
->
<?php
    $allowtype = array("gif","png","jpg");
    $size = 1000000;
    $path = "./upload";
    
    if($_FILES['myfile']['error'] > 0){
        echo "文件上傳錯誤";
        switch($_FILES['myfile']['error']){
            case 1 :die('上傳文件大小超過了PHP配置文件中的約定值');
            case 2 :die('上傳文件大小超過了瀏覽器中的約定值');
            case 3 :die('文件只被上傳部分');
            case 4 :die('沒有上傳的文件');
            default :die('其它錯誤');
        }
    }
    
    $hz = array_pop(explode(".",$_FILES['myfile']['name']));
    if(!in_array($hz,$allowtype)){
        die("這個后綴是<b>{$hz}</b>不是允許的類型");
    }
    
    if($_FILES['myfile']['size'] > $size){
        die("超過了允許的<b>$size</b>字節大小");
    }
    
    $filename = date("YmdHis").rand(100,999).".".$hz;
    
    if(is_uploaded_file($_FILES['myfile']['tmp_name'])){
        if(!move_uploaded_file($_FILES['myfile']['tmp_name'],$path.'/'.$filename)){
            die("不能將文件移動到指定目錄");
        }
    }else{
        die("上傳文件：{$_FILES['myfile']['name']}不是一個合法文件");
    }
    
    echo "文件{$myfile}上傳成功，保存在目錄{$path}中，大小為{$_FILES['myfile']['size']}字節";
?>

用POST方法將文件上傳時主要運用到的是$_FILES[]全局數組

$_FILES是一個二維數組 $_FILES['myfile']['name'] $_FILES['myfile']['tmp_name'] $_FILES['myfile']['size'] $_FILES['myfile']['error'] $_FILES['myfile']['type']

用到的函數有：is_uploaded_file()  move_uploaded_file()

 

 

 

多個文件上傳時只需要運用myfile[]數組即可 此時的$_FILES是三維數組

<form action = "upload.php" method = "POST" enctype = "multipart/form-data">
            <input type = "hidden" name = "MAXN_FILIE_SIZE" value = "100000">
            選擇文件1：<input type = "file" name = "myFile[]">
            選擇文件2：<input type = "file" name = "myFile[]">
            選擇文件3：<input type = "file" name = "myFile[]">
            <input type = "submit" value = "上傳文件">
        </form>