我正在嘗試構建數組路徑以減少代碼。原因是有大約 50 條長路徑，我想減少代碼庫。對于“test-2”，變量“$path”可以被硬編碼，同時右側“key-X”應該能夠調整，例如用于以后的 for 循環。問題：是否可以構建“test-2”中描述的數組路徑？想要的結果：測試 1：60測試 2：60<?php$arrayWithPrettyLongName = [ 'level_1' => [ 'key_1' => 10, 'key_2' => 20, 'key_3' => 30, ]];// Test-1 // Works fine!$result_1 =$arrayWithPrettyLongName['level_1']['key_1'] +$arrayWithPrettyLongName['level_1']['key_2'] +$arrayWithPrettyLongName['level_1']['key_3'] ;echo $result_1;// Test-2 // Throws errors.$path = "$arrayWithPrettyLongName['level_1']";$result_2 =$path . ['key_1'] +$path . ['key_2'] +$path . ['key_3'] ;echo $result_2;錯誤PHP Parse error: syntax error, unexpected '' (T_ENCAPSED_AND_WHITESPACE), expecting '-' or identifier (T_STRING) or variable (T_VARIABLE) or number (T_NUM_STRING) in Xxx.php on line 18
2 回答
吃雞游戲
TA貢獻1829條經驗 獲得超7個贊
我認為您真正想知道的是如何創建數組引用。您可以通過在數組名稱前添加 & 符號來實現此目的
<?php
$arrayWithPrettyLongName = [
'level_1' => [
'key_1' => 10,
'key_2' => 20,
'key_3' => 30,
]
];
// Test-1 // Works fine!
$result_1 =
$arrayWithPrettyLongName['level_1']['key_1'] +
$arrayWithPrettyLongName['level_1']['key_2'] +
$arrayWithPrettyLongName['level_1']['key_3'] ;
echo $result_1;
echo "\n";
//Just create an array reference here, by preceding the name with an `&`
$path = &$arrayWithPrettyLongName['level_1'];
//Also remove the `.` symbol here. That's not the correct syntax
$result_2 =
$path['key_1'] +
$path['key_2'] +
$path['key_3'] ;
echo $result_2;
但看！如果你真的想減少代碼，難道就不能這樣做嗎？
$result_3 = 0;
foreach ($arrayWithPrettyLongName['level_1'] as $value){
$result_3 += $value;
}
echo $result_3;
如果以后數組變大，保存就會很麻煩。
一只斗牛犬
TA貢獻1784條經驗 獲得超2個贊
像這里一樣工作：
<?php
$arrayWithPrettyLongName = [
'level_1' => [
'key_1' => 10,
'key_2' => 20,
'key_3' => 30,
]
];
// Test-1
$result_1 =
$arrayWithPrettyLongName['level_1']['key_1'] +
$arrayWithPrettyLongName['level_1']['key_2'] +
$arrayWithPrettyLongName['level_1']['key_3'] ;
echo $result_1; //output 60
// Test-2
$path = $arrayWithPrettyLongName['level_1'];
$result_2 =
$path['key_1'] +
$path['key_2'] +
$path['key_3'] ;
echo $result_2; //output 60
?>
你錯了$path = "$arrayWithPrettyLongName['level_1']";必須是沒有""
另一個改變是$path .必須是$path['key_1'];
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