数组类型之间的差异-PHP

就像别人说的你的问题是 只是语法

$array:3 = [     // :3 is not valid
  0 => "email"   //no commas
  1 => " email"  //no commas + extra spaces in emails
  2 => " email"  //no commas + extra spaces in emails
]

更正为:

$array = [
  0 => "email",
  1 => "email",
  2 => "email",
]

或者对其中任何一个:

$array = [0=>"email",1 => "email",2 => "email"];
$array = array(0=>"email", 1=>"email", 2=>"email");

$array = array("email","email","email");

因为这只会产生默认键:

array(3) {
  [0]=>
  string(5) "email"
  [1]=>
  string(5) "email"
  [2]=>
  string(5) "email"
}

因此,如果语法正确,两者之间没有区别。

• https://www.w3schools.com/php/php_arrays_multi.asp https://www.w3schools.com/php/php_arrays.asp https://www.tutorialspoint.com/php/php_arrays.htm
• https://laraveldaily.com/echoing-dd-vs-var_dump-vs-print_r/

如果第一个示例不是有效的PHP代码,则主要区别在于。

部分 array:3 使其无效。

$array = [
  0 => "email",
  1 => "email",
  2 => "email"
];

$array = ['email', 'email', 'email'];

除此之外,在第一个例子中,一些“email”以空格开头,两个数组都是相等的。如果不显式提供键,则元素将从0开始编号。

documentation .