Convert normal integer to 8 bit integer in PHP

Question

I have an Integer 138 that i want to covert into an 8 bit signed Integer that will become -118. I have tried unpack, intval and several othe php function but they didn't worked. How should i do this, stuck in this for few days now.

score 3 · Accepted Answer · answered Nov 30 '19 at 08:03

3

There may be other ways, but a quick look at using pack and unpack - pack with C stores it as an unsigned and the unpack with c gets the signed value back...

echo unpack( 'c', pack('C', 138))[1];

gives

-118

answered Nov 30 '19 at 08:03

Nigel Ren

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Convert normal integer to 8 bit integer in PHP

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