How to check duplicate value inside foreach loop - php

Question

I have 3 array like this from foreach loop
$link = 'https://example.com/page/';
$parse = explode('/', $link);
for ($i = 0;$i <= 5;$i++)
{
if($i > 0) {
$link = $parse[0]."//".$parse[1]."/".$parse[2]."/".$parse[3]."/".$parse[4].$i;
$get[$i] = curl($link);
$re = '/class="img-lazy" src="(.*?)"/m';
preg_match_all($re, $get[$i], $matches);
foreach ($matches[1] as $content)
{
echo $content. "\r\n";
}
}
}
(loop from each page eg: example.com/page/1 will contain the array below and so on with page 2/3...)
Result:
Array (Page 1)
(
[0] => https://example.com/img1.jpg
[1] => https://example.com/img2.jpg
)
Array (Page 2)
(
[0] => https://example.com/img3.jpg
[1] => https://example.com/img4.jpg
)
Array (Page 3 nonexist auto redirect to page 1)
(
[0] => https://example.com/img1.jpg
[1] => https://example.com/img2.jpg
)
The last one is duplicate. How do i remove it ?
I already tried to merge the array and array_unique function. But the duplicate one still there.

Answer 1

Quick solution run for loop only 5 times if loop is dynamic follow this answer
What I did is compare very first link. if it repeat then exit.
I checked and it works fine
your images are nice :-)
$get = array();
$firstcompare = 0;
$firsttime = 1;
for ($i = 0;$i <= 17;$i++)
{
if($i > 0) {
$dup = $res = [];
$link = $parse[0]."//".$parse[1]."/".$parse[2]."/".$parse[3]."/".$parse[4].$i;
$get[$i] = curl($link);
$re = '/class="aligncenter" src="(.*?)"/m';
preg_match_all($re, $get[$i], $matches);
if($firsttime){
$stringlink = $matches[1][0];
$firsttime = 0;
}
foreach ($matches[1] as $content)
{
if($firstcompare){
if ($stringlink==$content) {
exit;
}else{
// echo $content."\n\n";
echo "<img src=' $content ' /> " . "\r\n";
}
}else{
// echo $content."\n\n";
$firstcompare = 1;
echo "<img src=' $content ' /> " . "\r\n";
}
}
}
}

Answer 2

You may try like this as per yourArray, hope it will help you
Using Foreach:
$dup = $res = [];
foreach($yourArray as $arr){
$imploded = #implode(',',$arr);
if(!in_array($imploded, $dup)){
$dup[] = $imploded;
$res[] = $arr;
}
}
(or)
Using Array Function:
$unique = array_unique(array_map(function($arr){
return #implode(',',$arr);
}, $yourArray));
$mapped = array_map(function($a){
return #explode(',', $a);
}, $unique_data);

Answer 3

I don't really understand everything but to remove duplicate data inside an array you can use the array_unique() function.
foreach(array_unique($yourArray) as $value):
// Code goes here
endforeach;
It takes the array and return the clean one
https://www.php.net/manual/fr/function.array-unique.php

Answer 4

Here is the best way to remove duplicate values from the multi-dimensional array by using PHP or Laravel.
Solution:
$input = array_map("unserialize", array_unique(array_map("serialize", $input)));
$input = Array
(
[0] => Array
(
[0] => abc
[1] => def
)
[1] => Array
(
[0] => ghi
[1] => jkl
)
[2] => Array
(
[0] => mno
[1] => pql
)
[3] => Array
(
[0] => abc
[1] => def
)
[4] => Array
(
[0] => ghi
[1] => jkl
)
[5] => Array
(
[0] => mno
[1] => pql
)
)
$input = array_map("unserialize", array_unique(array_map("serialize", $input)));
Output :
Array
(
[0] => Array
(
[0] => abc
[1] => def
)
[1] => Array
(
[0] => ghi
[1] => jkl
)
[2] => Array
(
[0] => mno
[1] => pql
)
[3] => Array
(
[0] => ghi
[1] => jkl
)
[4] => Array
(
[0] => mno
[1] => pql
)
)