Question

以下代码有效。我有以下数组，我想用array_column搜索并在（n）列返回相应的值。目前，我的代码只返回右侧的列或左侧的列。

现有工作代码

function getField_UnitPrice($xmc) {
    // Key values MUST ALWAYS BE UNIQUE.
    // Values on the left.
    $xmpd_db = array(
    1 => array('EA_WTRESRVD', '122.67'),
    2 => array('EA_WTRESRV', '184.00'),
    3 => array('EA_FEEASBT', '300.00'),
    4 => array('GL_WTREXTWP', '0.64'),
    5 => array('GL_WTREXTWPA', '0.96')

  );

  $search_result = array_column($xmpd_db, 1, 0);
  return $search_result[$xmc];

}

正如您所看到的，此函数返回您查找的代码的价格，但如果数组数组的列数超过2列会怎样？

我认为答案在于下面的代码行，但无论我如何更改这些索引只不过代码列显示..

$search_result = array_column($xmpd_db, 1, 0);

目标

function getField_Target($xmc, $column_index)
    {
    // Key values MUST ALWAYS BE UNIQUE.
    // Values on the left.
    $xmpd_db = array(
    1 => array('EA', 'WTRESRVD', 'EMERGENCY SERVICE CALL', '122.67'),
    2 => array('EA', 'WTRESRV', 'EMERGENCY SERVICE CALL AFTER HOURS', '184.00')

  );

  $search_result = array_column($xmpd_db, 0, 1);
  return $search_result[$xmc];

    }

解决方案

/* $field, 1, 0 = EA */
$unit_of_measure = getField_Target($field, 1, 0);
/* $field, 1, 1 = WTRESRVD*/
$code = getField_Target($field, 1, 1);
/* $field, 1, 2 = EMERGENCY SERVICE CALL*/
$code_desc = getField_Target($field, 1, 2);
/* $field, 1, 3 = 000.00*/
$code_price = getField_Target($field, 1, 3);

// Call
echo $unit_of_measure . " - " . $code . " - " . $code_desc . " - " . $code_price . "<br>";

function getField_Target($xmc, $column_index = 1, $column_value = 3) {
    // Key values MUST ALWAYS BE UNIQUE.
    // Values on the left.
    $xmpd_db = array(
    1 => array('EA', 'EA_WTRESRVD', 'EMERGENCY SERVICE CALL', '000.10'),
    2 => array('EA', 'EA_WTRESRV', 'EMERGENCY SERVICE CALL AFTER HOURS', '000.20')

    );

  $search_result = array_column($xmpd_db, $column_value, $column_index);

  return $search_result[$xmc];

}

Answer 1

您需要的是......

$search_result = array_column($xmpd_db, 3, 1);

这样做是取第3个（实际上是第4个，因为它是零基础）字段（价格字段）并将其索引到第1个（即第2个）列。

所以$search_result最终为

Array

    (
        [WTRESRVD] => 122.67
        [WTRESRV] => 184.00
    )

扩展代码...

function getField_Target($xmc, $column_index = 1, $column_value = 3)
    {
    // Key values MUST ALWAYS BE UNIQUE.
    // Values on the left.
    $xmpd_db = array(
    1 => array('EA', 'WTRESRVD', 'EMERGENCY SERVICE CALL', '122.67'),
    2 => array('EA', 'WTRESRV', 'EMERGENCY SERVICE CALL AFTER HOURS', '184.00')

  );

  $search_result = array_column($xmpd_db, $column_value, $column_index);
  return $search_result[$xmc];

    }

所以，

echo getField_Target('WTRESRV');        // 184.00
echo getField_Target('WTRESRV', 1, 2);  // EMERGENCY SERVICE CALL AFTER HOURS

使用array_column搜索数组数组，在（n）列返回相应的值。如何？

1 个答案: