本文实例讲述了PHP校验表单检测字段是否为空的方法。分享给大家供大家参考。具体如下：
PHP校验表单，检测字段是否为空，当表单中有未填写的字段，则会显示错误信息。
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PHP
$errorcount=0;
if (!trim($_POST['nickname'])) {
echo "
Nickname is required."; $errorcount++; } if (!trim($_POST['title'])) { echo "
Title is required."; $errorcount++; } if ($errors > 0) echo "
Please use your browser's back button " . "to return to the form,and correct error(s)"; ?>
Nickname is required."; $errorcount++; } if (!trim($_POST['title'])) { echo "
Title is required."; $errorcount++; } if ($errors > 0) echo "
Please use your browser's back button " . "to return to the form,and correct error(s)"; ?>
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" " (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.
希望本文所述对大家的PHP程序设计有所帮助。
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