You can check for these things in advance by using file_exists and is_readable.
您可以通过使用file_exists和is _ readable预先检查这些问题。
No schemes can check our advance to victory.
任何阴谋也不能阻止我们胜利前进。
Most of the time you will not, but is is better to check in advance, rather than after an injury.
大多数时候你并不需要，但是事前最好核实一下，不要等到受伤之后再说。
Check your inventory in advance.
提前检查你的库存。
Check your inventory in advance.
提前检查你的库存。
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