如何正确运用PHP filter判断过滤数据
在的数据，系统就会完整的输出’boy@163.com’。如果是错误的格式，比如’boy’，就会输出false。如果没有填写表单中的email字段，系统输出null，也就是空。
<ol class="dp-xml"><li class="alt"><span><span>echo filter_input(INPUT_POST, <br>‘email’, FILTER_VALIDATE_EMAIL); </span></span></li></ol>
第四种、PHP filter根据要求过滤输入的变量的内容
和上面唯一的不同是第二个参数使用FILTER_SANITIZE_EMAIL，输出的结果会不同。假设通过表单的POST过来的一个字段email。
如果是类似’boy@163.com’的数据，系统就会完整的输出’boy@163.com’。如果是错误的格式，比如’boy-afds3′，只要是数字和字母和划线等email格式中可以出现的内容，系统同样会完整的输出’boy-afds3′。如果没有填写表单中的email字段，系统输出null，也就是空。如果是’boy阿三’，系统会把email格式中不允许的东西去除，输出’boy’。
<ol class="dp-xml"><li class="alt"><span><span>echo filter_input<br>(INPUT_POST, ‘email’, <br>FILTER_SANITIZE_EMAIL); </span></span></li></ol>
以上就是PHP filter的具体功能介绍，希望对又需要的朋友有所帮助。
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