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Two examples of php judging that the array is empty_PHP tutorial

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Release： 2016-07-13 16:59:23
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The following provides two PHP codes that determine whether the array is empty. Because the array is a composite data type, we cannot process it like other character data. See examples below.

Method
1. Use count (array) to get records. Empty returns 0
2. Use is_null function

The code is as follows
 代码如下 复制代码

$a=array('1','2','3');
echo count($a);


if(is_null($a)){
echo '000';
}else{
echo "1111";
}
?>
Copy code
$a=array('1','2','3');

echo count($a);


if(is_null($a)){
代码如下 复制代码
/**
array(
); 空
array(
array(
),
array(
),
array(
)
); 空
array(
array(
),
array(
array(
),
array(
1=>1
)
),
array(
)
); 非 空
*/
function is_array_null($value)
{
if (empty($value))
{
return $value;
}
else
{
return is_array($value) ? array_map('array_null', $value) : addslashes($value);
}
}
echo '000'; }else{ echo "1111"; } ?>

The count method is feasible The is_null method does not work Example 2 //Determine whether an array is empty
The code is as follows Copy code
/** array( ); 空
array(
array( ), array( ), array( ) ); 空 array( array( ), array( array( ), array( 1=>1 ) ), array( ) ); 非 空 */ function is_array_null($value) { if (empty($value)) { return $value; } else { return is_array($value) ? array_map('array_null', $value) : addslashes($value); } } http://www.bkjia.com/PHPjc/631319.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/631319.htmlTechArticleThe following provides two PHP codes that determine whether the array is empty, because the array is a composite data type and we cannot It is processed like other character data, see examples below. Method 1. Use cou...
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