php trim() 表单验证不为空实例,应该算是入门级的实例了,告诉你如何利用trim函数来删除空格然后判断用户提交的数据是否为空.

formerrorcheck.php

 class="brush:php;"> 
	 
	nickname is required."; 
	     $errors++; 
	  } 
	 
	  if (!trim($firstname)) { 
	      echo "
first name is required."; 
	     $errors++; 
	  } 
	 
	  if (!trim($lastname)) { 
	      echo "
last name is required."; 
	      $errors++; 
	  } 
	 
	  if (!trim($email)) { 
	      echo "
primary email address is required."; 
	      $errors++; 
	  } 
	 
	  if ($errors > 0) 
	      echo "


please use your browser's back button " . 
	        "to return to the form, and correct error(s)"; 
	 
	 
	 
	 
	 

这是个简单的验证函数: