示例：
$str='www.02405.com'; $arr=str_split($str);输出：
array:13 [ 0 => "w" 1 => "w" 2 => "w" 3 => "." 4 => "0" 5 => "2" 6 => "4" 7 => "0" 8 => "5" 9 => "." 10 => "c" 11 => "o" 12 => "m" ]
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