PHP中使用基本數(shù)學(xué)運(yùn)算的方法如下：1.加法用 號(hào)，支持整數(shù)和浮點(diǎn)數(shù)，也可用于變量，字符串?dāng)?shù)字會(huì)自動(dòng)轉(zhuǎn)換但不推薦依賴(lài)；2.減法用-號(hào)，變量同理，類(lèi)型轉(zhuǎn)換同樣適用；3.乘法用*號(hào)，適用于數(shù)字及類(lèi)似字符串；4.除法用/號(hào)，需避免除以零，并注意結(jié)果可能是浮點(diǎn)數(shù)；5.取模用%號(hào)，可用于判斷奇偶數(shù)，處理負(fù)數(shù)時(shí)余數(shù)符號(hào)與被除數(shù)一致。正確使用這些運(yùn)算符的關(guān)鍵在于確保數(shù)據(jù)類(lèi)型清晰并處理好邊界情況。

Sure, here's how you actually use basic math in PHP. It’s straightforward, but there are a few things worth pointing out.

Adding numbers with

Use the plus sign to add two numbers. This works for both integers and floats.

echo 5   3; // Outputs: 8

You can also add variables:

$a = 10;
$b = 5;
echo $a   $b; // Outputs: 15

Just keep in mind that if one of the values is a string that looks like a number (like "12"), PHP will usually convert it automatically. But relying on that can be risky — better to make sure your values are numeric before doing math.

Subtracting with -

Same idea as addition, just use the minus sign:

echo 10 - 4; // Outputs: 6

Variables work the same way:

$x = 20;
$y = 7;
echo $x - $y; // Outputs: 13

Again, type juggling applies here too. If you subtract something that isn't a number, you might get unexpected results or warnings.

Multiplication with *

Multiply using the asterisk symbol:

echo 6 * 3; // Outputs: 18

With variables:

$val1 = 8;
$val2 = 4;
echo $val1 * $val2; // Outputs: 32

This one's pretty safe — as long as both values are numbers (or number-like strings), it should work fine.

Division with /

Divide using the forward slash:

echo 20 / 4; // Outputs: 5

What if you divide by zero? That triggers a warning. So always make sure the denominator isn’t zero:

$numerator = 10;
$denominator = 0;

if ($denominator != 0) {
    echo $numerator / $denominator;
} else {
    echo "Can't divide by zero!";
}

Also note that dividing integers doesn’t always give an integer result:

echo 5 / 2; // Outputs: 2.5

If you want only the integer part, cast it or use intval().

Modulo with %

The percent sign gives you the remainder after division:

echo 10 % 3; // Outputs: 1

It’s useful for checking even/odd numbers:

• Even: $number % 2 == 0
• Odd: $number % 2 == 1

But watch out — modulo works with negative numbers too, and the sign of the result matches the dividend:

echo -10 % 3; // Outputs: -1
echo 10 % -3; // Outputs: 1

So behavior can vary depending on what you're expecting.

That's all the basic operators. They do exactly what you'd expect most of the time, but don't ignore edge cases like dividing by zero or mixing types. Keep your data clean and check your inputs, and you’ll avoid most issues.

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