Filtro de selección en un Query String con PHP

Ejemplo de como implementar un filtro de selección que opera sobre un query string, petición de un API end point, basado en el diseño RHS (Right Hand Side)

Funciones y Clases

class FilterParam {
    public string $fieldName = "", $operator = "asc";
    public $value;
    
  public function __construct(string $fieldName, string $operator, $value) {
      $this->fieldName = $fieldName;
      $this->operator = $operator;
      $this->value = $value;

  }
}

function isFilterParamRHS($field) {
	 return preg_match('/([[:word:]]+):\b(eq|lt)\b=([[:word:] :-]+)/', $field);	
}

function getFieldRHS($s) {
    preg_match('/([[:word:]]+):/', $s, $match);
    return $match[1];
}

function getFilterOperatorRHS($s) {
    preg_match('/:\b(eq|lt)\b/', $s, $match);
    return $match[1];
}

function getValueRHS($s) {
	preg_match('/=([[:word:] :-]+)/', $s, $match);
    return $match[1];
}

function parserFilterRHS($s) {
	$s_split = explode(',', $s);
	$arr = [];
	foreach ($s_split as $row) {
	    if (isFilterParamRHS($row)) {
 	    	$arr[] = new FilterParam(
 	    		getFieldRHS($row),
 	    		getFilterOperatorRHS($row),
 	    		getValueRHS($row)
 	    		);
	    }
	}	
	return $arr;
}

Su uso

$s1 = "price:eq=200,date:lt=2022-11-04";

$s = $s1;
echo('sort_filter=' . $s . PHP_EOL);
$data = parserFilterRHS($s);
print_r($data);

Salida

sort_filter=price:eq=200,date:lt=2022-11-04
Array
(
    [0] => FilterParam Object
        (
            [fieldName] => price
            [operator] => eq
            [value] => 200
        )

    [1] => FilterParam Object
        (
            [fieldName] => date
            [operator] => lt
            [value] => 2022-11-04
        )

)

Banco de prueba online Filter Query String PHP

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