PHP文件实现图片上传代码

HTML代码

<html>
<head>
    <meta charset="utf-8">
    <title>拾柒's Blog图片上传实例</title>
</head>
<body>
    <form action="up.php" method="post" enctype="multipart/form-data">
        <label for="file">文件名：</label>
        <input type="file" name="file" id="file"><br>
        <input type="submit" name="submit" value="提交">
    </form>
</body>
</html>

PHP代码

<?php
// 允许上传的图片后缀
$allowedExts = array("gif", "jpeg", "jpg", "png");
$temp = explode(".", $_FILES["file"]["name"]);
echo $_FILES["file"]["size"];
$extension = end($temp);     // 获取文件后缀名
if (
    (
        ($_FILES["file"]["type"] == "image/gif") ||
        ($_FILES["file"]["type"] == "image/jpeg") ||
        ($_FILES["file"]["type"] == "image/jpg") ||
        ($_FILES["file"]["type"] == "image/pjpeg") ||
        ($_FILES["file"]["type"] == "image/x-png") ||
        ($_FILES["file"]["type"] == "image/png")
    )
    && ($_FILES["file"]["size"] < 204800)   // 小于 200 kb
    && in_array($extension, $allowedExts)
) {
    if ($_FILES["file"]["error"] > 0) {
        echo "错误：: " . $_FILES["file"]["error"] . "<br>";
    } else {
        echo "上传文件名: " . $_FILES["file"]["name"] . "<br>";
        echo "文件类型: " . $_FILES["file"]["type"] . "<br>";
        echo "文件大小: " . ($_FILES["file"]["size"] / 1024) . " kB<br>";
        echo "文件临时存储的位置: " . $_FILES["file"]["tmp_name"] . "<br>";
    <span class="token comment"><span class="hljs-comment">// 判断当前目录下的 upload 目录是否存在该文件</span></span>
    <span class="token comment"><span class="hljs-comment">// 如果没有 upload 目录，你需要创建它，upload 目录权限为 777</span></span>
    <span class="token keyword"><span class="hljs-keyword">if</span></span> <span class="token punctuation">(</span><span class="token function">file_exists</span><span class="token punctuation">(</span><span class="token string double-quoted-string"><span class="hljs-string">"upload/"</span></span> <span class="token operator">.</span> <span class="token global">$_FILES</span><span class="token punctuation">[</span><span class="token string double-quoted-string"><span class="hljs-string">"file"</span></span><span class="token punctuation">]</span><span class="token punctuation">[</span><span class="token string double-quoted-string"><span class="hljs-string">"name"</span></span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword"><span class="hljs-keyword">echo</span></span> <span class="token global">$_FILES</span><span class="token punctuation">[</span><span class="token string double-quoted-string"><span class="hljs-string">"file"</span></span><span class="token punctuation">]</span><span class="token punctuation">[</span><span class="token string double-quoted-string"><span class="hljs-string">"name"</span></span><span class="token punctuation">]</span> <span class="token operator">.</span> <span class="token string double-quoted-string"><span class="hljs-string">" 文件已经存在。 "</span></span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span> <span class="token keyword"><span class="hljs-keyword">else</span></span> <span class="token punctuation">{</span>
        <span class="token comment"><span class="hljs-comment">// 如果 upload 目录不存在该文件则将文件上传到 upload 目录下</span></span>
        <span class="token function">move_uploaded_file</span><span class="token punctuation">(</span><span class="token global">$_FILES</span><span class="token punctuation">[</span><span class="token string double-quoted-string"><span class="hljs-string">"file"</span></span><span class="token punctuation">]</span><span class="token punctuation">[</span><span class="token string double-quoted-string"><span class="hljs-string">"tmp_name"</span></span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token string double-quoted-string"><span class="hljs-string">"upload/"</span></span> <span class="token operator">.</span> <span class="token global">$_FILES</span><span class="token punctuation">[</span><span class="token string double-quoted-string"><span class="hljs-string">"file"</span></span><span class="token punctuation">]</span><span class="token punctuation">[</span><span class="token string double-quoted-string"><span class="hljs-string">"name"</span></span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword"><span class="hljs-keyword">echo</span></span> <span class="token string double-quoted-string"><span class="hljs-string">"文件存储在: "</span></span> <span class="token operator">.</span> <span class="token string double-quoted-string"><span class="hljs-string">"upload/"</span></span> <span class="token operator">.</span> <span class="token global">$_FILES</span><span class="token punctuation">[</span><span class="token string double-quoted-string"><span class="hljs-string">"file"</span></span><span class="token punctuation">]</span><span class="token punctuation">[</span><span class="token string double-quoted-string"><span class="hljs-string">"name"</span></span><span class="token punctuation">]</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

} else {
echo “非法的文件格式”;
}