PHP array操作10个小技巧分享

复制代码 代码如下:

$capitals = array(
'Alabama' => 'Montgomery',
'Alaska' => 'Juneau',
'Arizona' => 'Phoenix'
);

复制代码 代码如下:

$capitals['Arkansas'] = 'Little Rock';

复制代码 代码如下:

unset($capitals['California']);

复制代码 代码如下:

$capitals = array(
'Alabama' => 'Montgomery',
'Alaska' => 'Juneau',
'Arizona' => 'Phoenix'
);
$states = array_flip($capitals);
// $states = array(
// 'Montgomery' => string 'Alabama',
// 'Juneau' => string 'Alaska',
// 'Phoenix' => string 'Arizona'
// );

复制代码 代码如下:

$stateCapitals = array(
'Alabama' => 'Montgomery',
'Alaska' => 'Juneau',
'Arizona' => 'Phoenix'
);
$countryCapitals = array (
'Australia' => 'Canberra',
'Austria' => 'Vienna',
'Algeria' => 'Algiers'
);
$capitals = array_merge($stateCapitals, $countryCapitals);

复制代码 代码如下:

function capitalize($element)
{
$element = strtolower($element);
return ucwords($element);
}
$capitals = array(
'Alabama' => 'montGoMEry',
'Alaska' => 'Juneau',
'Arizona' => 'phoeniX'
);
$capitals = array_map("capitalize", $capitals);

复制代码 代码如下:

$capitals = array(
'Arizona' => 'Phoenix',
'Alaska' => 'Juneau',
'Alabama' => 'Montgomery'
);
ksort($capitals);

复制代码 代码如下:

$capitals = array(
'Arizona' => 'Phoenix',
'Alaska' => 'Juneau',
'Alabama' => 'Montgomery'
);
shuffle($capitals);

复制代码 代码如下:

$capitals = array(
'Arizona' => 'Phoenix',
'Alaska' => 'Juneau',
'Alabama' => 'Montgomery'
);
if (in_array("Juneau", $capitals))
{
echo "Exists!";
} else {
echo "Does not exist!";
}

复制代码 代码如下:

$capitals = array(
'Arizona' => 'Phoenix',
'Alaska' => 'Juneau',
'Alabama' => 'Montgomery'
);
if (array_key_exists("Alaska", $capitals))
{
echo "Key exists!";
} else {
echo "Key does not exist!";
}

复制代码 代码如下:

$capitals = array(
'Arizona' => 'Phoenix',
'Alaska' => 'Juneau',
'Alabama' => 'Montgomery'
);
$state = array_search('Juneau', $capitals);
// $state = 'Alaska'

复制代码 代码如下:

$capitals = array(
'Arizona' => 'Phoenix',
'Alaska' => 'Juneau',
'Alabama' => 'Montgomery'
);
$arrayObject = new ArrayObject($capitals);
foreach ($arrayObject as $state => $capital)
{
printf("The capital of %s is %s<br />", $state, $capital);
}
// The capital of Arizona is Phoenix
// The capital of Alaska is Juneau
// The capital of Alabama is Montgomery