substr with strlen

I have an amount like 0003000, the last 2 digits are the decimal number. I want to transform 0003000 to 00030,00 (insert a decimal comma in front of the last 2 digits). I tried to do this with substring. I take the length of the string with strlen and then I make -2, but it ignores the -2.

Here is an example, why is it being ignored?

substr($this->arrCheck['amountsum'],0,(strlen($this->arrCheck['a开发者_运维问答mountsum']-2)))

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It's because your -2 is in the strlen function instead of outside it:

strlen($this->arrCheck['amountsum']-2)

Should be:

strlen($this->arrCheck['amountsum'])-2

But all in all you don't need to use strlen, since substr accepts a negative number as number of characters before the end of the string: PHP Manual

So your whole code above can be replace by:

substr($this->arrCheck['amountsum'], 0, -2)

And the whole thing can be achieved by:

substr($this->arrCheck['amountsum'], 0, -2).','.substr($this->arrCheck['amountsum'], -2)

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You have the strlen close bracket after the -2. Try:

substr($this->arrCheck['amountsum'],0,(strlen($this->arrCheck['amountsum'])-2))

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you don't need strlen() in this case, try:

substr($this->arrCheck['amountsum'], 0, -2) . ',' . substr($this->arrCheck['amountsum'], -2)

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You can also do the folowing:

echo substr_replace("0003000", ",", -2, 0); // output: 00030,00

echo number_format("0003000" / 100, 2, ',', ''); // output: 30,00

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use number_format() instead. That will be easy to use.

http://www.w3schools.com/php/func_string_number_format.asp

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You can use number_format

http://php.net/manual/en/function.number-format.php

or correct your code.

substr($this->arrCheck['amountsum'],0,(strlen($this->arrCheck['amountsum']) -2))

you can't place -2 into strlen() function

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this way ?

substr($this->arrCheck['amountsum'], 0, -2).','.substr($this->arrCheck['amountsum'], -2);