A few instructions on removing duplicate elements from an array in php_PHP Tutorial

For example:

Copy code The code is as follows:

$test_array=array(1,2,3,4,4,5 ,5,6);
$test_array_unique=array_unique($test_array);
print_r($test_array_unique);
$test_array=array(1,2,3,4,4,5,5,6 );
$test_array_unique=array_unique($test_array);
print_r($test_array_unique);

But now, don’t be careless, it’s not over yet. If you look carefully, you will find that although the repeated elements have been removed, the indexes of the remaining elements have not changed. In this case, if you use a for loop to call this array element, an error will occur, because the for loop is based on The number is increasing, and most people use count($test_array_unique) to get the size of the array, which will cause some elements to be missed;

Copy code The code is as follows:

$test_array=array(1,2,3,4,4,5,5,6);
$test_array_unique=array_unique($test_array);
for ($i=0;$i{
echo $test_array_unique[$i];
}
$test_array=array(1,2,3 ,4,4,5,5,6);
$test_array_unique=array_unique($test_array);
for($i=0;$i{
echo $test_array_unique[$i];
}

This way you will not see element 6 being output, because the index of 6 is 8, the array before processing and the array index after processing do not Any changes;
Solution:
Of course, there are too many solutions here. I only introduced a method that I think is relatively simple, which is the function array_values. array_values ​​returns the value of the array and has nothing to do with the index. , after this processing, a new array will be formed, strictly according to the numerically increasing index, and then use the for loop to output the edges, everything will be OK!

Copy code The code is as follows:

$test_array=array(1,2,3,4,4,5,5 ,6);
$test_array_unique=array_values(array_unique($test_array));
for($i=0;$i{
echo $ test_array_unique[$i];
}

http://www.bkjia.com/PHPjc/319740.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/319740.htmlTechArticleFor example: Copy the code as follows: $test_array=array(1,2,3,4,4,5, 5,6); $test_array_unique=array_unique($test_array); print_r($test_array_unique); $test_array=array(1,2,3,4,4,5,5,6);...