如何在PHP中添加两个数字并连接一个字符串？ [重复]

Question

This question already has an answer here:

• Concatenation with addition in it doesn't work as expected 2 answers

I am trying to study PHP. Suppose i have two variable

$A=5;
$B=10;

then i want to print the sum as Sum = 15

for that i wrote

echo "Sum=".$A+$B;

But i am getting only the value of $B. that means my result is

10

What is the error in my printing statement?

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Answer 1

You need to check for the operator precedence over here you statement'll be evaluated as

echo ("Sum=".$A)+$B;

instead you need to write it like as

echo "Sum=".($A+$B);

or you can write it like as

echo "Sum=",$A+$B;

Demo