PHP array concatenation and reorganization-PHP Tutorial-php.cn

PHP array concatenation and reorganization

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Release： 2016-08-23 09:17:46

Original

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The current code is like this
array(6) {
[0] => string(5) "58,86"
[1] => string(5) "68,78"
[2] = > string(5) "65,78"
[3] => string(5) "60,82"

But the content required for data processing should be
array(1){

<code>[0] => 58,68,65,60
[1] => 86,78,78,82</code>

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}

Please tell me how to process the data

After thinking about it, the idea is to traverse first, then split the values and then splice them together. However, during the final assembly, there is an empty key. I don’t know where it comes from.
array(6) {
[0] => string(5 ) "58,86"
[1] => string(5) "68,78"
[2] => string(5) "65,78"
[3] => string(5) " 60,82"
[4] => string(3) "094"
[5] => string(2) "40"
}、

foreach($lsj['data'] as $key=>$val){

<code>    $a[''] = $a[$key] = explode(',',$val);
   }
   </code>

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After

we get
array(7) {
[0] => array(2) {

<code>[0] => string(2) "58"
[1] => string(2) "86"</code>

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}
[""] => array(1) {

<code>[0] => string(2) "40"</code>

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}
[1] => array(2) {

<code>[0] => string(2) "68"
[1] => string(2) "78"</code>

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}
[2] => array(2) {

<code>[0] => string(2) "65"
[1] => string(2) "78"</code>

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}
[3] => array(2) {

<code>[0] => string(2) "60"
[1] => string(2) "82"</code>

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}
[4] => array(1) {

<code>[0] => string(3) "094"</code>

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}
[5] => array(1) {

<code>[0] => string(2) "40"</code>

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}
}
Then assemble the same key into a new array. Because my PHP version is 5.4 and I cannot use array_column, I wrote a public method i_array_column()

$b['data1'] = i_array_column($a,'0');
$b['data2'] = i_array_column($a,'1');

Get 1 array
array(2) {
["data1"] => array(7) {

<code>[0] => string(2) "58"
[""] => string(2) "40"
[1] => string(2) "68"
[2] => string(2) "65"
[3] => string(2) "60"
[4] => string(3) "094"
[5] => string(2) "40"</code>

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}
["data2"] => array(7) {

<code>[0] => string(2) "86"
[""] => NULL
[1] => string(2) "78"
[2] => string(2) "78"
[3] => string(2) "82"
[4] => NULL
[5] => NULL</code>

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}
}
Because highcharts requires json format, convert it to json format
dump(json_encode($b));,
The result after accurate conversion is
string(146) "{"data1":{"0":"58" ,"":"40","1":"68","2":"65","3":"60","4":"094","5":"40"}," data2":{"0":"86","":null,"1":"78","2":"78","3":"82","4":null,"5" :null}}"

I just don’t know why there is an empty array

Reply content:

The current code is like this
array(6) {
[0] => string(5) "58,86"
[1] => string(5) "68,78"
[2] = > string(5) "65,78"
[3] => string(5) "60,82"

But the content required for data processing should be
array(1){

<code>[0] => 58,68,65,60
[1] => 86,78,78,82</code>

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}

Please tell me how to process the data

foreach($lsj['data'] as $key=>$val){

<code>    $a[''] = $a[$key] = explode(',',$val);
   }
   </code>

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After

we get
array(7) {
[0] => array(2) {

<code>[0] => string(2) "58"
[1] => string(2) "86"</code>

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}
[""] => array(1) {

<code>[0] => string(2) "40"</code>

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}
[1] => array(2) {

<code>[0] => string(2) "68"
[1] => string(2) "78"</code>

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}
[2] => array(2) {

<code>[0] => string(2) "65"
[1] => string(2) "78"</code>

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}
[3] => array(2) {

<code>[0] => string(2) "60"
[1] => string(2) "82"</code>

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}
[4] => array(1) {

<code>[0] => string(3) "094"</code>

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}
[5] => array(1) {

<code>[0] => string(2) "40"</code>

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}
}
Then assemble the same key into a new array. Because my PHP version is 5.4 and I cannot use array_column, I wrote a public method i_array_column()

$b['data1'] = i_array_column($a,'0');
$b['data2'] = i_array_column($a,'1');

Get 1 array
array(2) {
["data1"] => array(7) {

<code>[0] => string(2) "58"
[""] => string(2) "40"
[1] => string(2) "68"
[2] => string(2) "65"
[3] => string(2) "60"
[4] => string(3) "094"
[5] => string(2) "40"</code>

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}
["data2"] => array(7) {

<code>[0] => string(2) "86"
[""] => NULL
[1] => string(2) "78"
[2] => string(2) "78"
[3] => string(2) "82"
[4] => NULL
[5] => NULL</code>

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I just don’t know why there is an empty array

<code class="php"><?php 
$arr = ["58,86,1,18",
"68,78,2,17",
"65,78,3,17",
"60,82,4,19",
"4,5,6,18"];


array_walk($arr, function(&$item) {
    $item = explode(',', $item);
});

$new_arr = [];
$length = count($arr);
for ($i = 0; $i < $length; $i++) {
    $length1 = count($arr[$i]);
    for ($j = 0; $j < $length1; $j++) {
        $new_arr[$j][$i] = $arr[$i][$j];
    }
}

array_walk($new_arr, function(&$item) {
    $item = join(',', $item);
});

print_r($new_arr);</code>

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Matrix transpose, the above method can be extended to multi-dimensional matrices

Write one that only handles your situation. After analysis, your situation is to split the strings in the array

<code>    $arr = array("58,86","68,78","65,78","60,82");
    foreach($arr as $key => $value){
        $tmp = explode(',',$value);
        $a[] = $tmp[0];
        $b[] = $tmp[1];
    }
    $c = array(
        implode(',',$a),implode(',',$b)
    );
    print_r($c);</code>

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