爲什麼gettype（）表示它是double，但var_dump（）表示float？

Question

爲什麼gettype（）表示它是double，但var_dump（）表示float？

$number = 123456789; 
echo "Number: {$number} is a ". gettype($number) . "\n"; 
var_dump($number); 

響應：

編號：1.23456789012E + 18是雙
浮動（1.23456789012E + 18）

Answer 1

他們是同樣的事情http://php.net/manual/en/language.types.float.php

Answer 2

直接從PHP.net（gettype()）：

個爲返回的字符串

候選條件值是：

... 「雙規」（由於歷史原因，「雙」返回在浮動的情況下，而不是簡單的「浮動」） .. 。

Answer 3

<br> 
<?php 
     /*begins with a function that runs a Console msg for PHP */ 
function console_sn($txt){ 
$temp = ""; 
$temp .= "<script>"; 
$temp .= "console.info('frm_PHP: '+'"; 
$temp .= $txt; 
$temp .= "');"; 
$temp .= "</script>"; 
echo $temp; 
} 
echo("<br><hr><br>"); 
//end of PHP console function 

//Main primary code for this Example begins below 

//run these examples below in your test PHP file and see the results in your JS console window 

//e.g.#1 
$code1 = "1212"; 
console_sn(gettype(floatval($code1))); 

//e.g.#2 
$code2 = "1212sn"; 
console_sn(gettype(floatval($code2))); 

//e.g.#3 
$code3 = "1212"; 
console_sn(gettype((trim($code3))*1)); 

//e.g.#4 
$code4 = "1212sn"; 
console_sn(gettype((trim($code4))*1)); 

?>