Array_unique removes duplicate arrays from a two-dimensional array in php_PHP tutorial

A method to use array_unique in PHP to remove duplicate values ​​from secondary arrays. Friends in need can refer to it.

function a_array_unique($array)//Written better
{
$out = array();
foreach ($array as $key=>$value) {
if (!in_array($value, $out))
{
$out[$key] = $value;
}
}
return $out;
}
?>

The code is as follows

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$input = array(“a” => “green”,”", “red”,”b” => “green”, “”,”blue”, “red”,”c” => “witer”,”hello”,”witer”); //$result = array_unique($input); //去除重复元素 $result = a_array_unique($input);?? //只留下单一元素 foreach($result as $aa) { echo $aa.” ”; } function multi_unique($array) { foreach ($array as $k=>$na) $new[$k] = serialize($na); $uniq = array_unique($new); foreach($uniq as $k=>$ser) $new1[$k] = unserialize($ser); return ($new1); } function a_array_unique($array)//写的比较好 { $out = array(); foreach ($array as $key=>$value) { if (!in_array($value, $out)) { $out[$key] = $value; } } return $out; } ?>

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代码如下

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function unique_arr($array2D,$stkeep=false,$ndformat=true) { // 判断是否保留一级数组键 (一级数组键可以为非数字) if($stkeep) $stArr = array_keys($array2D); // 判断是否保留二级数组键 (所有二级数组键必须相同) if($ndformat) $ndArr = array_keys(end($array2D)); //降维,也可以用implode,将一维数组转换为用逗号连接的字符串 foreach ($array2D as $v){ $v = join(“,”,$v); $temp[] = $v; } //去掉重复的字符串,也就是重复的一维数组 $temp = array_unique($temp); //再将拆开的数组重新组装 foreach ($temp as $k => $v) { if($stkeep) $k = $stArr[$k]; if($ndformat) { $tempArr = explode(“,”,$v); foreach($tempArr as $ndkey => $ndval) $output[$k][$ndArr[$ndkey]] = $ndval; } else $output[$k] = explode(“,”,$v); } return $output; } $array2D = array(‘first’=>array(‘title’=>’1111′,’date’=>’2222′),’second’=>array(‘title’=>’1111′,’date’=>’2222′),’third’=>array(‘title’=>’2222′,’date’=>’3333′)); print_r($array2D); print_r(unique_arr($array2D,true));

$input = array("a" => "green","", "red","b" => "green", "","blue", "red","c" => " witer","hello","witer");
//$result = array_unique($input); //Remove duplicate elements
$result = a_array_unique($input);?? //Only a single element left
foreach($result as $aa)
{
echo $aa.”
”;
}
function multi_unique($array) {
foreach ($array as $k=>$na)
$new[$k] = serialize($na);
$uniq = array_unique($new);
foreach($uniq as $k=>$ser)
$new1[$k] = unserialize($ser);
return ($new1);
}

The array_unique function only applies to one-dimensional arrays and is not applicable to multi-dimensional arrays. However, we can achieve array_unique to remove duplicate arrays by traversing the data and then performing operations.

The code is as follows

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function unique_arr($array2D,$stkeep=false,$ndformat=true) { // Determine whether to retain the first-level array key (the first-level array key can be non-numeric) if($stkeep) $stArr = array_keys($array2D); // Determine whether to retain the secondary array keys (all secondary array keys must be the same) if($ndformat) $ndArr = array_keys(end($array2D)); //Dimensionality reduction, you can also use implode to convert a one-dimensional array into a string connected with commas foreach ($array2D as $v){ $v = join(“,”,$v); $temp[] = $v; } //Remove repeated strings, that is, repeated one-dimensional arrays $temp = array_unique($temp); //Reassemble the disassembled array foreach ($temp as $k => $v) { if($stkeep) $k = $stArr[$k]; if($ndformat) { $tempArr = explode(“,”,$v); foreach($tempArr as $ndkey => $ndval) $output[$k][$ndArr[$ndkey]] = $ndval; } else $output[$k] = explode(“,”,$v); } return $output; } $array2D = array('first'=>array('title'=>'1111′,'date'=>'2222′),'second'=>array('title'=>'1111 ′,'date'=>'2222′),'third'=>array('title'=>'2222′,'date'=>'3333′)); print_r($array2D); print_r(unique_arr($array2D,true)); http://www.bkjia.com/PHPjc/628911.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/628911.htmlTechArticleA method to use array_unique in PHP to remove duplicate values ​​from secondary arrays. Friends in need can refer to it. The code is as follows Copy the code ?php $input = array(a = green,, red,b = gre...