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substr cutting Chinese characters problem
Cutting is one of the characters using substr very common PHP syntax
But it
Because in the next UTF-8 encoding,
Text in a word for three yuan group, so cut the first four yuan Group will print error code characters

So now tell you
mb_substr
This function
This function can be used to specify the encoding string
And so
Specify four words is four characters Oh
I hope people are looking at this article helpful
The following examples are listed

echo substr("大家好",0,4);
echo "
";
echo mb_substr("大家好",0,4,"UTF-8");