Laravel 8 Str::before() {#collection-method}
Str::before 方法返回字符串中指定值之前的所有内容：
use Illuminate\Support\Str;
$slice = Str::before('This is my name', 'my name');
// 'This is ' 温馨提示
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Str::before 方法返回字符串中指定值之前的所有内容：
use Illuminate\Support\Str;
$slice = Str::before('This is my name', 'my name');
// 'This is '