如何从PHP会话数组中删除变量
我有用于向会话添加变量的PHP代码:如何从PHP会话数组中删除变量,php,arrays,session,Php,Arrays,Session,我有用于向会话添加变量的PHP代码: <?php session_start(); if(isset($_GET['name'])) { $name = isset($_SESSION['name']) ? $_SESSION['name'] : array(); $name[] = $_GET['name']; $_SESSION['name'] = $name; } if (isset($_POST
<?php
session_start();
if(isset($_GET['name']))
{
$name = isset($_SESSION['name']) ? $_SESSION['name'] : array();
$name[] = $_GET['name'];
$_SESSION['name'] = $name;
}
if (isset($_POST['remove']))
{
unset($_SESSION['name']);
}
?>
<pre> <?php print_r($_SESSION); ?> </pre>
<form name="input" action="index.php?name=<?php echo $list ?>" method="post">
<input type="submit" name ="add"value="Add" />
</form>
<form name="input" action="index.php?name=<?php echo $list2 ?>" method="post">
<input type="submit" name="remove" value="Remove" />
</form>
要从会话中删除特定变量,请使用:
unset($_SESSION['variableName']);
()或
注意:
session\u unregister()
从PHP 5.3.0起已被弃用,从PHP 5.4.0起已被删除。尝试以下方法:
$ar[0]==2
$ar[1]==7
$ar[2]==9
unset ($ar[2])
当前正在清除名称数组,需要调用该数组,然后调用要在数组中取消设置的索引:
<?php
# remove by key:
function array_remove_key ()
{
$args = func_get_args();
return array_diff_key($args[0],array_flip(array_slice($args,1)));
}
# remove by value:
function array_remove_value ()
{
$args = func_get_args();
return array_diff($args[0],array_slice($args,1));
}
$fruit_inventory = array(
'apples' => 52,
'bananas' => 78,
'peaches' => 'out of season',
'pears' => 'out of season',
'oranges' => 'no longer sold',
'carrots' => 15,
'beets' => 15,
);
echo "<pre>Original Array:\n",
print_r($fruit_inventory,TRUE),
'</pre>';
# For example, beets and carrots are not fruits...
$fruit_inventory = array_remove_key($fruit_inventory,
"beets",
"carrots");
echo "<pre>Array after key removal:\n",
print_r($fruit_inventory,TRUE),
'</pre>';
# Let's also remove 'out of season' and 'no longer sold' fruit...
$fruit_inventory = array_remove_value($fruit_inventory,
"out of season",
"no longer sold");
echo "<pre>Array after value removal:\n",
print_r($fruit_inventory,TRUE),
'</pre>';
?>
if (isset($_POST['remove'])) {
$key=array_search($_GET['name'],$_SESSION['name']);
if($key!==false)
unset($_SESSION['name'][$key]);
$_SESSION["name"] = array_values($_SESSION["name"]);
}
在数组中取消设置值的两种方法:
<?php
# remove by key:
function array_remove_key ()
{
$args = func_get_args();
return array_diff_key($args[0],array_flip(array_slice($args,1)));
}
# remove by value:
function array_remove_value ()
{
$args = func_get_args();
return array_diff($args[0],array_slice($args,1));
}
$fruit_inventory = array(
'apples' => 52,
'bananas' => 78,
'peaches' => 'out of season',
'pears' => 'out of season',
'oranges' => 'no longer sold',
'carrots' => 15,
'beets' => 15,
);
echo "<pre>Original Array:\n",
print_r($fruit_inventory,TRUE),
'</pre>';
# For example, beets and carrots are not fruits...
$fruit_inventory = array_remove_key($fruit_inventory,
"beets",
"carrots");
echo "<pre>Array after key removal:\n",
print_r($fruit_inventory,TRUE),
'</pre>';
# Let's also remove 'out of season' and 'no longer sold' fruit...
$fruit_inventory = array_remove_value($fruit_inventory,
"out of season",
"no longer sold");
echo "<pre>Array after value removal:\n",
print_r($fruit_inventory,TRUE),
'</pre>';
?>
if (isset($_POST['remove'])) {
$key=array_search($_GET['name'],$_SESSION['name']);
if($key!==false)
unset($_SESSION['name'][$key]);
$_SESSION["name"] = array_values($_SESSION["name"]);
}
由于$\u会话['name']
是一个数组,因此需要找到指向感兴趣的名称值的数组键。最后一行重新排列数组的索引以供下次使用。美元会话['name']变量是数组吗?如果要从数组中删除特定的键,必须在unset()调用中引用该键,否则将删除整个数组,例如
<?php
$_SESSION['foo'] = 'bar'; // set session
print $_SESSION['foo']; //print it
unset($_SESSION['foo']); //unset session
?>
代码片段的另一个小问题是:将GET查询参数与POST表单混合在一起。有什么原因不能在隐藏字段中传递“name”的表单吗?最好不要混合使用get和post变量,尤其是在其他地方使用$\u请求时。您可能会遇到各种各样的乐趣,试图弄清楚为什么$\u GET['name']与$\u POST['name']的显示方式不同,因为服务器在'variables\u order'.ini设置中设置了不同的EGPCS顺序
如果要删除或取消设置所有$\u会话,请尝试此操作
如果要删除特定的$\u会话['name'],请尝试此操作
简单地使用这个方法
@Anthony如果它不在标签内,你可以。噢!我没有看到它不是(手掌放在额头上)它从数组中删除所有值,而不是单个值:(如果您试图“删除”/“取消设置”的变量是一个数组,那么该数组将被删除。例如$\u会话['myarray']=array('key'=>val,'key2'=>val2);usnet($\u会话['myarray']将取消设置数组…但是取消设置($\u会话['myarray']['key2']将删除第二个数组元素-(key,value)pairsession_unregister()“此函数从PHP 5.3.0起已被弃用,从PHP 5.4.0起被删除。”;
<form blah blah blah method="post">
<input type="hidden" name="name" value="<?= htmlspecialchars($list1) ?>" />
<input type="submit" name="add" value="Add />
</form>
session_destroy();
session_unset('name');
<?php
$_SESSION['foo'] = 'bar'; // set session
print $_SESSION['foo']; //print it
unset($_SESSION['foo']); //unset session
?>