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"; echo substr("Hello world",1)."
"; echo substr("Hello world",3)."
"; echo substr("Hello world",7)."
"; echo "
"; // Negative numbers: echo substr("Hello world",-1)."
"; echo substr("Hello world",-10)."
"; echo substr("Hello world",-8)."
"; echo substr("Hello world",-4)."
"; ?>
运行结果
d
ello world
lo world
orld
d
ello world
lo world
orld