当我给$error数组提供索引['；1'；]时，它从索引1开始??为什么会发生这种情况 - When i give the $error array the index of ['1'] it starts to begin with the index 1?? why is this happening?

When i give the $error array the index of ['1'] it starts to begin with the index 1?? why is this happening?

<?php
echo "<pre>";
print_r($_POST);
echo "</pre>";
if(isset($_POST['calculate'])) {
    //  creating an array
    $error = array();

    if((isset($_POST['buyer']) && is_numeric($_POST['buyer'])) || (isset($_POST['seller']) && is_numeric($_POST['seller']))) {
        //  setting index
        $error ['buyer'] ['0'] = "the byer or seller is not numeric";
        $error ['seller'] ['0'] = "the seller is not numericc";
    } elseif((isset($_POST['buyer']) && !empty($_POST['buyer'])) || (isset($_POST['seller']) && !empty($_POST['seller']))) {
        $buyer = $_POST['buyer'];
        $seller = $_POST['seller'];
        // here the error comes
    } else {
        $error ['buyer'] ['1'] = "please input the buyer name";
        $error ['seller'] ['1'] = "please input the seller name";
    }
    if(empty($_POST['product'])) {
        $error ['product'] ['0'] = "Please select a Product";
    }
//   so finally print the array shows the index which i didn't want to start from  1
    echo "<pre>";
    print_r($error);
    echo "</pre>";
// the buyer associative array starts indexing from1
}

?>

之所以会发生这种情况，是因为这是预期的行为。观察到的行为符合规范。

参考：http://php.net/types.array

摘录：

键可以是整数，也可以是字符串。该值可以是任何类型。

此外，还会发生以下密钥转换：

包含有效整数的字符串将强制转换为整数类型。例如，键"；8〃；将实际存储在8以下