如何使用PHP从字符串中获取字符串的特定部分？

Question

我有这种格式的RGBA颜色：

RGBA:1.000000,0.003922,0.003922,0.003922

如何将每个值与此字符串分开，例如：

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

我想在php中这样做。

Answer 1

将字符串拆分为两部分，:作为分隔符，取第二部分，然后再次使用,作为分隔符拆分结果。将值分配给变量。所有这些都可以在一行中完成，如下所示：

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

输出：

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

Demo

Answer 2

代码段应该是这样的：

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

Answer 3

使用正则表达式的另一种方法是

$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