CODEWITHSUNDEEP
phpforeach
cj333
cj333

Reputation: 2609

PHP How to mixed the two FOREACH data random?

I tried this method, but it caused Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 42 bytes) in E:\www\json_example\4.php on line 170 the line in foreach foreach($data_b as $b) $arr[] =.

so in addition to the this method, is there any easy way can mixed the two FOREACH data random? less cost memory. (Not quite necessarily sort by title) Thanks.

foreach($data_a as $a){
 //$a['title'];
 //$a['content'];
 $arr[] = array('title' => html_entity_decode($a['title'], ENT_QUOTES, 'UTF-8'),'content' => html_entity_decode($a['content'], ENT_QUOTES, 'UTF-8'));
}

foreach($data_b as $b){
 //$b['title'];
 //$b['content'];
 $arr[] = array('title' => html_entity_decode($b['title'], ENT_QUOTES, 'UTF-8'),'content' => html_entity_decode($b['content'], ENT_QUOTES, 'UTF-8'));
}

function cmp($aa, $bb)
{
    $t1 = $aa['title'];
    $t2 = $bb['title'];
    if ($t1 == $t2) return 0;
    return $t1 < $t2 ? -1 : 1;
}
usort($arr, 'cmp');

foreach ($arr as $item){
  echo $item['title'];
  echo $item['content'];
}

Upvotes: 0

Views: 384

Answers (3)

XzKto
XzKto

Reputation: 2502

Try to free memory as soon as you don't need it anymore:

function _h_dec($val) {
    return html_entity_decode($val, ENT_QUOTES, 'UTF-8');
}
foreach ($data_a as $key => $a) {
    $arr[] = array('title' => _h_dec($a['title']), 'content' => _h_dec($a['content']));
    unset($data_a[$key]);
}
unset($data_a);

foreach ($data_b as $key => $b) {
    $arr[] = array('title' => _h_dec($b['title']), 'content' => _h_dec($b['content']));
    unset($data_b[$key]);
}
unset($data_b);

function cmp($aa, $bb) {
    $t1 = $aa['title'];
    $t2 = $bb['title'];
    if ($t1 == $t2)
        return 0;
    return $t1 < $t2 ? -1 : 1;
}

usort($arr, 'cmp');

foreach ($arr as $item) {
    echo $item['title'];
    echo $item['content'];
}

Upvotes: 1

Gary Tsui
Gary Tsui

Reputation: 1755

hi have you tried this: Php's shuffle. http://php.net/manual/en/function.shuffle.php

Upvotes: 1

Berry Langerak
Berry Langerak

Reputation: 18859

so in addition to the this method, is there any easy way can mixed the two FOREACH data random? less cost memory. (Not quite necessarily sort by title)

Apparently, you have a huge dataset, as you're reaching the limit of 134217728 bytes (which is ~134MB). The main question is; where are you getting this data from? Is it from two different data sources, or one source (e.g. a database)? In my experience, people tend to solve problems like this in PHP, while it would be easily solved with a SELECT ... UNION SELECT ... ORDER BY RANDOM( );

Upvotes: 3

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