PHP Laravel 检查数组是否为空
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PHP Laravel Check if Array is empty
提问by Srima
I am struggling with displaying some content depending on if an array does have a value or not.Every time the code in the else part is executed. What's wrong here? Is there any syntax error with this code? I'm using php laravel.
我正在努力根据数组是否有值来显示一些内容。每次执行 else 部分中的代码时。这里有什么问题？这段代码有语法错误吗？我正在使用 php laravel。
foreach($now as $v)
{
$arry[$c++]=$v->Code;
}
if($arry==null){
Do Something
}
else{
Do Something else
}
回答by Sand Of Vega
if($arry) {
echo 'The array is not empty';
}
else {
echo 'The array is empty';
}
For more: How can you check if an array is empty?
更多信息：如何检查数组是否为空？
回答by Manoj Negi
if (sizeof($arry) > 0) Do Something else Do Something else
if (sizeof($arry) > 0) 做点别的做点别的
回答by Aleksandrs
Better to do if (!empty($arry)) {}
最好做 if (!empty($arry)) {}
P.S. yes if (!$arry)do the same, but every person which is not familiar with php or even have little understanding of programming, should understand the code. Whats mean "not array", but if it will be "not empty array" is more clear. It is very straight forward.
PS 是的if (!$arry)也一样，但是每个不熟悉php甚至对编程知之甚少的人都应该了解代码。什么是“非数组”，但如果它是“非空数组”就更清楚了。这是非常直接的。
Clean code
干净的代码
回答by Raghbendra Nayak
Always check array before iterate in foreach and check with count function to check its value
在 foreach 中迭代之前始终检查数组并检查计数函数以检查其值
if(isset($now) && count($now)>0){
foreach($now as $v) {
$arry[$c++]=$v->Code;
}
}
if(count($arry)>0){
Do Something
}
else{
Do Something else
}
回答by Nisfan
this is not related to Laravel framework
这与 Laravel 框架无关
if (count($arry) > 0)
Do Something
else
Do Something else
回答by Jay Teli
You can use empty()or count()or sizeof()as below :
您可以使用empty()或count()或sizeof()如下：
$a = [];
if(empty($a)) {
echo 'empty' . PHP_EOL;
} else {
echo '!empty' . PHP_EOL;
}
if(count($a) == 0) {
echo 'empty' . PHP_EOL;
} else {
echo '!empty' . PHP_EOL;
}
if(sizeof($a) == 0) {
echo 'empty' . PHP_EOL;
} else {
echo '!empty' . PHP_EOL;
}
echo empty($a) . PHP_EOL; // 1
echo count($a) . PHP_EOL; // 0
echo sizeof($a) . PHP_EOL; // 0
Output :
empty
empty
empty
1
0
0
