SunshinePHP 2019 CFP Started

apcu_exists

(PECL apcu >= 4.0.0)

apcu_existsChecks if entry exists

说明

mixed apcu_exists ( mixed $keys )

Checks if one or more APCu entries exist.

参数

keys

A string, or an array of strings, that contain keys.

返回值

Returns TRUE if the key exists, otherwise FALSE Or if an array was passed to keys, then an array is returned that contains all existing keys, or an empty array if none exist.

范例

Example #1 apcu_exists() example

<?php
$fruit  
'apple';
$veggie 'carrot';

apcu_store('foo'$fruit);
apcu_store('bar'$veggie);

if (
apcu_exists('foo')) {
    echo 
"Foo exists: ";
    echo 
apcu_fetch('foo');
} else {
    echo 
"Foo does not exist";
}

echo 
PHP_EOL;
if (
apcu_exists('baz')) {
    echo 
"Baz exists.";
} else {
    echo 
"Baz does not exist";
}

echo 
PHP_EOL;

$ret apcu_exists(array('foo''donotexist''bar'));
var_dump($ret);

?>

以上例程的输出类似于:

Foo exists: apple
Baz does not exist
array(2) {
  ["foo"]=>
  bool(true)
  ["bar"]=>
  bool(true)
}

参见

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