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<?php $my_array = [ "keywords" => "test", "locationId" => [ 0 => "1", 1 => "2"], "industries" => "1" ]; var_export( array_map( function($v) { return implode(',', (array)$v); }, $my_array ) );
Output for 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 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
array ( 'keywords' => 'test', 'locationId' => '1,2', 'industries' => '1', )

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149.57 ms | 407 KiB | 5 Q