如何從一個字符串中使用PHP獲取特定部分的字符串？

Question

我有一個RGBA顏色格式爲：

RGBA:1.000000,0.003922,0.003922,0.003922 

我怎麼能每個值從這個字符串，如分離：

var alpha = 1.000000; 
var red = 0.003922; 
var green = 0.003922; 
var blue = 0.003922; 

我想這樣做在PHP。

Answer 1

將字符串拆分爲兩部分，以:作爲分隔符，取第二部分，並以,作爲分隔符再次拆分結果。將值分配給變量。所有這一切都可以在一個行完成，如下所示：

list($alpha, $red, $green, $blue) = explode(',', explode(':', $str, 2)[1]); 

輸出：

string(8) "1.000000" 
string(8) "0.003922" 
string(8) "0.003922" 
string(8) "0.003922 

Demo

Answer 2

代碼片段應該是這樣的：

$rgba = "1.000000,0.003922,0.003922,0.003922"; 
$rgba = explode(',', $rgba); 
list($red, $green, $blue, $alpha) = $rgba; 

Answer 3

另一種方法使用正則表達式是

$str = 'RGBA:1.000000,0.003922,0.003922,0.003922'; 
preg_match_all("/(\d+\.+\d+)/", $str, $output_array); 

list($alpha, $red, $green, $blue) = $output_array[1] ; 

https://eval.in/135090