What are the implications of using double quotes around array keys in PHP scripts, as seen in the code snippet provided?

Using double quotes around array keys in PHP scripts can lead to unnecessary overhead as PHP will treat the key as a string and perform variable interpolation. This can impact the performance of the script, especially when dealing with large arrays. To solve this issue, simply use single quotes around array keys to ensure that PHP interprets them as string literals. 

// Incorrect usage of double quotes around array keys
$array = ["key1" => "value1", "key2" => "value2"];

// Corrected usage of single quotes around array keys
$array = ['key1' => 'value1', 'key2' => 'value2'];

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double quotes array keys PHP scripts implications code snippet

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