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@ 2019-06-30T15:14:24Z

<?php
$condition = array(
	'AND',
	array(
		array(
			'field' => 'grid_enable',
			'compare' => '==',
			'value' => 1
		),
	),
	array(
		array(
			'field' => 'grid_column',
			'compare' => '>=',
			'value' => 3
		),
	),
	array(
		'OR',
		array(
			'field' => 'filter',
			'compare' => '!=',
			'value' => 1
		),
		array(
			'field' => 'align',
			'compare' => '==',
			'value' => 'left'
		)
	),
	array(
		array(
			'field' => 'grid_gutter',
			'compare' => '==',
			'value' => 'large'
		),
	),
);

print_r($condition);
$final_result = '';
$double = false;
foreach($condition as $k=>$v){
    $result = [];
    if(!is_array($v)){
        $operator_out = $v;
    }else{
        foreach($v as $k1=>$v1){
          if(!is_array($v1)){
              $operator_inn = $v1;
          }else{
              $result[] = implode(' ',array_values($v1));
          }
        }
    }

    if(count($result) == 1){
        if($double){
          $final_result.= " ".$operator_out." ".$result[0];    
        }else{
          $final_result.= $result[0]." ".$operator_out." ";    
        }
        
    }
    else if(count($result) == 2){
        $final_result.= "(".implode(" $operator_inn " , $result).")";
        $double= true;
    }
}
echo $final_result;
?>

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [0] => AND [1] => Array ( [0] => Array ( [field] => grid_enable [compare] => == [value] => 1 ) ) [2] => Array ( [0] => Array ( [field] => grid_column [compare] => >= [value] => 3 ) ) [3] => Array ( [0] => OR [1] => Array ( [field] => filter [compare] => != [value] => 1 ) [2] => Array ( [field] => align [compare] => == [value] => left ) ) [4] => Array ( [0] => Array ( [field] => grid_gutter [compare] => == [value] => large ) ) ) grid_enable == 1 AND grid_column >= 3 AND (filter != 1 OR align == left) AND grid_gutter == large

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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