本文執行個體講述了php校正表單檢測欄位是否為空白的方法。
具體如下：
php校正表單，檢測欄位是否為空白，當表單中有未填寫的欄位，則會顯示錯誤資訊。
<html><body><form METHOD="POST" ACTION="ErrorCheck.php"><h1>Contact Information</h1><label>Nickname:</label><input TYPE="TEXT" NAME="nickname"><label>Title:</label><input TYPE="TEXT" NAME="title"><br /><input TYPE="SUBMIT" VALUE="Submit"><br /><input TYPE="RESET" VALUE="Clear the Form"></form></body></html>
php後端代碼，儲存為： ErrorCheck.php
<html><body><?php $errorcount=0; if (!trim($_POST['nickname'])) { echo "<br /><b>Nickname</b> is required."; $errorcount++; } if (!trim($_POST['title'])) { echo "<br /><b>Title</b> is required."; $errorcount++; } if ($errors > 0) echo "<br /><br />Please use your browser's back button " . "to return to the form, and correct error(s)"; ?></body></html>
trim()函數可以去除字串中的前後Null 字元
" " (ASCII 32 (0×20)), an ordinary space."\t" (ASCII 9 (0×09)), a tab."\n" (ASCII 10 (0x0A)), a new line (line feed)."\r" (ASCII 13 (0x0D)), a carriage return."\0″ (ASCII 0 (0×00)), the NUL-byte."\x0B" (ASCII 11 (0x0B)), a vertical tab.
總結：以上就是本篇文的全部內容，希望能對大家的學習有所協助。
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