How can I split a string at the first occurrence of “-” (minus sign) into two $vars with PHP?

problem ：

How can I split a string at the first occurrence of - (minus sign) into two $vars with PHP? How to appear for the first time - （ minus sign ） Split the string into two bands PHP Of $ vars？

I have found how to split on every "-" but, not only on the first occurrence. I have found out how to split each “ - ”, But not just when it first appeared .

example: example ：

this - is - line - of whatever - is - relevant$var1 = this$var2 = is - line - of whatever - is - relevant

Note, also stripped the first "-" . Be careful , Also stripped the first one “ - ”.

Thanks in advance for the help! Thank you for your help ！

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Solution ：

Reference resources ： https://stackoom.com/en/question/EiZ3