有人可以告诉我为什么我的php行中断不起作用（回显）吗？
我知道我可以用其他方式编写代码以使换行工作，但我想知道其背后的原因？
<?php
$var1 = 3;
echo "Addition = " . $var1 += 3 . "<br>";
echo "Subtraction = " . $var1 -= 3 . "<br>";
echo "Multiplication = " . $var1 *= 3 . "<br>";
echo "Division = " . $var1 /= 3 . "<br>";
?>
您可以使用逗号，
echo "Addition = " . $var1 += 3 , "<br>";
echo "Subtraction = " . $var1 -= 3 ,"<br>";
echo "Addition = " . $var1 *= 3 , "<br>";
echo "Addition = " . $var1 /= 3 ,"<br>";
或将其包装在方括号中：
echo "Addition = " . ($var1 += 3) . "<br>";
echo "Subtraction = " . ($var1 -= 3) ."<br>";
echo "Addition = " . ($var1 *= 3) . "<br>";
echo "Addition = " . ($var1 /= 3) ."<br>";
否则，该3数字将与串联<br>。
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