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Home Backend Development PHP Tutorial PHP入門-摘要表格處理有關(guān)問題

PHP入門-摘要表格處理有關(guān)問題

Jun 13, 2016 pm 12:24 PM
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PHP入門-摘要表格處理問題

幾天來學(xué)習(xí)下來.PHP和C/C++有太多的階段似系.所以,簡單的入門現(xiàn)在看來已經(jīng)沒有問題.然而,由于所選擇的條目是一個高速書籍,難免有些粗糙知識.例如,下面的兩個問題讓我吃了一些損失.

1. 文件標(biāo)簽的形式不能得到的文件名.

在書籍里面了解到,表單

有三個屬性,method, action,name .當(dāng)中那么標(biāo)記表單的名字,method表示使用哪種方式提交表達(dá),可選get/post.action指定處理表單的動作.能夠指定一個php頁面或者干脆就在當(dāng)前頁面處理.這一點實在非常奇妙而且方便.由于表單僅僅要指定了php的頁面,變量什么的都是和php共享的.

表單以下可選的標(biāo)簽有input?? select?? option?? textarea ,? 當(dāng)中option是select的一個子標(biāo)簽.

而input又能夠拓展成非常多類別的標(biāo)簽,通過input的type屬性指定.眼下我接觸到的主要有text? password?? file?? submit?? reset?? image .? 從左到右,依次是文本,密碼,文件,提交,重置,圖片. 這里圖片的意思不是用來展示的,而是用來替換submit使用的.而file屬性即提供一個供用戶上傳文件的渠道.書中給出的樣例,我對比著敲了一下,也試著獲取了一下文件信息,可是總是失敗,返回的一直是空.書中全然沒有給出不論什么解釋.源代碼例如以下:

<title>  注冊您的個人信息</title><meta http-equiv="content-type" content="text/html;charset=utf-8"><h1>  請輸入您的個人信息 </h1>
姓名:
學(xué)號:
郵箱:
密碼:
確認(rèn)密碼:
頭像:

通過搜集資料,發(fā)現(xiàn)非常多同學(xué)也遇到了同樣的問題.可能和我看的是一樣的書吧.只是總算是經(jīng)過一番努力以后找到了原因,原來是由于默認(rèn)情況下,html只支持text/html格式的文件傳輸.而表單須要多格式支持.所以解決的方法就是.在form中加入屬性 enctype="multipart/form-data" . ok問題解決.

我的regist.php的內(nèi)容例如以下:

<?phpheader ("Content-Type:text/html;charset=utf-8");echo "user info is as follow: <br>";echo "name is ".$_POST[username]."<br>";echo "number is ".$_POST[id]."<br>";echo "mail is ".$_POST[mail]."<br>";echo "password is ".$_POST[password]."<br>";print_r($_FILES);?>
上傳一個文件,測試一下:

輸入界面例如以下,我寫入一些信息,由于是字符界面,所以頭像部分是我手寫進(jìn)去的.

輸出界面例如以下.能夠看到文件是有信息的.當(dāng)中name表示在client的文件名稱,type表示文件類型.tmp_name表示在server端的暫時文件名稱

2. 表單的圖像標(biāo)簽不顯示圖像.

這個問題在大學(xué)的時候也遇到過,當(dāng)時攻克了.可是轉(zhuǎn)眼這么多年過去了.哪里還記得住啊.只是運氣號,試了幾下就又想起解決的方法了.

最初我指定的路徑是我其他的文件夾.所以圖片無法顯示,后來我把圖片放在了apache工作的根文件夾,即/var/www/html文件夾下,就能夠正常顯示了.想想也是,假設(shè)哪里的文件都能顯示,apache何必還要我們配置工作ROOT_DIRECTORY呢.

3. php亂碼問題

我們知道在html頁面中,編碼問題是通過meta標(biāo)簽指定http-equiv的方式來指定的.可是跳轉(zhuǎn)到php頁面以后,這個標(biāo)簽失效了.php又成了亂碼.怎么辦,想必是一定有現(xiàn)成的函數(shù)能夠使用的.所以就網(wǎng)上查了一下,果然.

在PHP文件的開頭處增加 header("Content-Type="text/html;charset=utf-8");問題解決.


ok.這就是這幾天學(xué)習(xí)PHP遇到的一些的問題.總結(jié)一下,尤其是第一個問題,查了非常久才找到一個合理的解釋.接下來的幾天我會繼不斷加深理解,本周可以寫一點東西.


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