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<?php $array = Array ( Array ( 'sexo_edad' => 'type1', 'fans' => 2 ), Array ( 'sexo_edad' => 'type2', 'fans' => 3 ), Array ( 'sexo_edad' => 'type1', 'fans' => 8 ), Array ( 'sexo_edad' => 'type2', 'fans' => 10 ) ); $type_values = array(); foreach ($array as &$arr) { if (isset($type_values[$arr['sexo_edad']])) { $arr['difference'] = $arr['fans'] - $type_values[$arr['sexo_edad']]; } else { $arr['difference'] = 0; } $type_values[$arr['sexo_edad']] = $arr['fans']; } print_r($array);
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
Array ( [0] => Array ( [sexo_edad] => type1 [fans] => 2 [difference] => 0 ) [1] => Array ( [sexo_edad] => type2 [fans] => 3 [difference] => 0 ) [2] => Array ( [sexo_edad] => type1 [fans] => 8 [difference] => 6 ) [3] => Array ( [sexo_edad] => type2 [fans] => 10 [difference] => 7 ) )
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Array ( [0] => Array ( [sexo_edad] => type1 [fans] => 2 [difference] => 0 ) [1] => Array ( [sexo_edad] => type2 [fans] => 3 [difference] => 0 ) [2] => Array ( [sexo_edad] => type1 [fans] => 8 [difference] => 6 ) [3] => Array ( [sexo_edad] => type2 [fans] => 10 [difference] => 7 ) )

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