Shulou(Shulou.com)06/02 Report--

Today, I will talk to you about how to remove array duplicates in PHP. Many people may not know much about it. In order to make you understand better, the editor has summarized the following for you. I hope you can get something according to this article.

There is a built-in function array_unique (), but the array_unique function of php is only suitable for one-dimensional arrays, not for multi-dimensional arrays. Here is an array_unique function of a two-dimensional array.

Function unique_arr ($array2D,$stkeep=false,$ndformat=true)

{

/ / decide whether to keep first-level array keys (first-order array keys can be non-numeric)

If ($stkeep) $stArr = array_keys ($array2D)

/ / decide whether to keep the secondary array keys (all secondary array keys must be the same)

If ($ndformat) $ndArr = array_keys (end ($array2D))

/ / Dimension reduction, or you can use implode to convert an one-dimensional array into a string concatenated with commas

Foreach ($array2D as $v) {

$v = join (",", $v)

$temp [] = $v

}

/ / remove the duplicate string, that is, the repeated one-dimensional array

$temp = array_unique ($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

}

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