检查所有数组项是否为空 PHP

我从一个表单中添加了一个项数组，如果它们都是空的，我想执行一些验证并添加一个错误字符串。所以我有:

$array = array(
'RequestID'       => $_POST["RequestID"],
'ClientName'      => $_POST["ClientName"],
'Username'        => $_POST["Username"],
'RequestAssignee' => $_POST["RequestAssignee"],
'Status'          => $_POST["Status"],
'Priority'        => $_POST["Priority"]
);

然后，如果所有的数组元素都是空的，那么执行:

$error_str .= '<li>Please enter a value into at least one of the fields regarding the request you are searching for.</li>';
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小开

Implode the array with an empty glue and check the size of the resulting string:

<?php if (strlen(implode($array)) == 0) echo 'all values of $array are empty'; ?>

Please note this is a safe way to consider values like 0 or "0" as not empty. The accepted answer using an empty array_filter callback will consider such values empty, as it uses the empty() function. Many form usages would have to consider 0 as valid answers so be careful when choosing which method works best for you.

小开

you don't really need it.
You're going to validate these fields separately and by finishing this process you can tell if array was empty (or contains invalid values, which is the same)

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最佳答案

You can just use the built in array_filter

If no callback is supplied, all entries of input equal to FALSE (see converting to boolean) will be removed.

So can do this in one simple line.

if(!array_filter($array)) {
echo '<li>Please enter a value into at least one of the fields regarding the request you are searching for.</li>';
}
小开

this is pretty simple:

foreach($array as $k => $v)
{
if(empty($v))
{
unset($array[$k]);
}
}
$show_error = count($array) == 0;

you would also have to change your encapsulation for your array values to double quotes.

小开

An older question but thought I'd pop in my solution as it hasn't been listed above.

function isArrayEmpty(array $array): bool {
foreach($array as $key => $val) {
if ($val !== '' || $val !== null) // remove null check if you only want to check for empty strings
return false;
}
return true;
}
小开

I had the same question but wanted to check each element in the array separately to see which one was empty. This was harder than expected as you need to create the key values and the actual values in separate arrays to check and respond to the empty array element.

print_r($requestDecoded);
$arrayValues = array_values($requestDecoded);  //Create array of values
$arrayKeys = array_keys($requestDecoded);      //Create array of keys to count
$count = count($arrayKeys);
for($i = 0; $i < $count; $i++){
if ( empty ($arrayValues[$i] ) ) {         //Check which value is empty
echo $arrayKeys[$i]. " can't be empty.\r\n";
}
}

Result:

Array
(
[PONumber] => F12345
[CompanyName] => Test
[CompanyNum] => 222222
[ProductName] => Test
[Quantity] =>
[Manufacturer] => Test
)

Quantity can't be empty.

小开

simplify use this way:

$array = []; //target array
$is_empty = true; //flag


foreach ($array as $key => $value) {
if ($value != '')
$is_empty = false;
}
if ($is_empty)
echo 'array is empty!';
else
echo 'array is not empty!';

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