我有以下形式：
<form action="#" method="POST" enctype="multipart/form-data">
from:
<select name="age_from" id="age_a" onchange="checkages_a()">
<option value=""></option>
<?php
for($i = 17; $i <= 50; ++$i) {
echo "'t", '<option value="', $i. '">', $i, '</option>', "'n";
}
?>
</select>
to:
<select name="age_to" id="age_b" onchange="checkages_b()">
<option value=""></option>
<?php
for($i = 18; $i <= 50; ++$i) {
echo "'t", '<option value="', $i, '">', $i, '</option>', "'n";
}
?>
</select>
<input type="radio" name="gender" value="male">Male</input> <br />
<input type="radio" name="gender" value="female">Female</input><br />
<input type="submit" class="btn btn-info"
name="submit_form" value="Click to start chat! " />
它的工作方式是用户可以从gender和age中选择两个选项之一，并搜索用户。不需要同时完成这两个选项即可进行搜索。
但是，如果未选择任何选项，我希望它保留在当前页面（'random_chat.php），并回显消息。
这是我的方法：
$refined_gender = isset($_POST['gender']) ? escape($_POST['gender']) : '';
$age_from = isset($_POST['age_from']) ? escape($_POST['age_from']) : '';
$age_to = isset($_POST['age_to']) ? escape($_POST['age_to']) : '';
if (isset($_POST['submit_form'])){
if (empty ($refined_gender) || empty($age_from) || empty ($age_to)) {
echo "<div class='no_user'><p> Please apply at least one of the filters above. </p> </div>";
} else {
// search user
}
目前，当我的两个搜索选项都为空时，消息会回显，这很好。但是当我搜索男性用户或年龄不为空时，该消息也会回响，这不应该发生。
您需要将||更改为&&，（其他一些更改也表示为注释）：-
<form method="POST" enctype="multipart/form-data"> <!-- remove action ='#' -->
from:
<select name="age_from" id="age_a" onchange="checkages_a()">
<option value=""></option>
<?php
for($i = 17; $i <= 50; ++$i) {
if(isset($_POST['age_from']) && $_POST['age_from'] == $i){ // to make selected value to be selected even after form submit
echo "'t", '<option value="', $i. '" selected ="selected">', $i, '</option>', "'n";
}else{
echo "'t", '<option value="', $i. '">', $i, '</option>', "'n";
}
}
?>
</select>
to:
<select name="age_to" id="age_b" onchange="checkages_b()">
<option value=""></option>
<?php
for($i = 18; $i <= 50; ++$i) {
if(isset($_POST['age_to']) && $_POST['age_to'] == $i){// to make selected value to be selected even after form submit
echo "'t", '<option value="', $i. '" selected ="selected">', $i, '</option>', "'n";
}else{
echo "'t", '<option value="', $i. '">', $i, '</option>', "'n";
}
}
?>
</select>
<input type="radio" name="gender" value="male">Male</input> <br />
<input type="radio" name="gender" value="female">Female</input><br />
<input type="submit" class="btn btn-info" name="submit_form" value="Click to start chat! " />
<form>
<?php
$refined_gender = isset($_POST['gender']) ? $_POST['gender'] : ''; // escape gives me undefined function error at my end so i removed it, but if it is working at your end thhen keep it up as it is.
$age_from = isset($_POST['age_from']) ? $_POST['age_from'] : '';
$age_to = isset($_POST['age_to']) ? $_POST['age_to'] : '';
if (empty ($refined_gender) && empty($age_from) && empty ($age_to)) { // check always with form posted value not submit button value and also cange || to &&
echo "<div class='no_user'><p> Please apply at least one of the filters above. </p> </div>";
} else {
// search user
}
?>
if 条件不反映您想要的内容 像这样修复它
if (empty ($refined_gender) && empty($age_from) && empty ($age_to)) {
echo "<div class='no_user'><p> Please apply at least one of the filters above. </p> </div>";
} else { // search user }