所以我现在正在开发一个小项目,允许用户在点击一个按钮后输入一个数字到文本框中,然后添加"添加"它应该将该值存储到数组中,然后允许用户在该数组中输入另一个值。当用户完成并且想要对称为"提交"的值进行求和时,页面上还有一个按钮。我遇到的问题是每次表单发回时,它都会重新创建一个新的空白数组。有什么提示吗?
请参阅以下代码:
<html>
<head>
</head>
<body>
<h2>Please Select your title and name:</h2>
<form action='<?php echo $_SERVER["PHP_SELF"]; ?>' method='post'>
<p>
<label for="strFirstname">Type number to add: </label>
<input type='text' name='strNumber' id='strNumber'/>
</p>
<p>
<input type='submit' name='submit' value='Add' />
</p>
<p>
<input type='submit' name='calculate' value='Compute' />
</p>
<?php
$array = array();
if (isset($_POST['submit']))
$num = $_POST['strNumber'];
$array[] = $num;
foreach($array as $num)
echo $num . ' + ';
if(isset($_POST['calculate']))
foreach($array as $num)
echo $num . ' + ';
?>
</form>
</body>
</html>
答案 0 :(得分:0)
<?php
session_start();
?>
<html>
<head>
</head>
<body>
<h2>Please Select your title and name:</h2>
<form action='' method='post'>
<p>
<label for="strFirstname">Type number to add: </label>
<input type='text' name='strNumber' id='strNumber'/>
</p>
<p>
<input type='submit' name='submit' value='Add' />
</p>
<p>
<input type='submit' name='calculate' value='Compute' />
<input type='submit' name='clear' value='clear' />
</p>
<?php
if (isset($_POST['submit'])) {
if(!array_key_exists("numbers", $_SESSION)) {
$_SESSION["numbers"] = array();
}
array_push($_SESSION["numbers"], $_POST["strNumber"]);
}
if(isset($_POST['clear'])) {
$_SESSION["numbers"] = array();
}
if(array_key_exists("numbers", $_SESSION)) {
echo implode("+", $_SESSION["numbers"]);
}
if(isset($_POST['calculate'])) {
if(array_key_exists("numbers", $_SESSION)) {
$expression = implode("+", $_SESSION["numbers"]);
eval( '$result = (' . $expression . ');' );
echo "=" . $result;
}
}
?>
</form>
</body>
</html>