Question

当我想在字符串中使用变量值时，我将它们连接起来。（点）运算符。

我看到有些人在字符串中使用{$ variable}。

所以......我的例子：

"my name is ".$variable

有些人使用它：

"my name is {$variable}"

上述两个例子有什么区别？

Answer 1

当你想在字符串中的变量中附加一个字符串时使用它。

$variable = 'hack';

// now I want to append 'ed' to $variable:    

echo "my name is {$variable}";   // prints my name is hack

echo "my name is {$variable}ed"; // prints my name is hacked

echo "my name is $variable";     // prints my name is hack

echo "my name is $variableed";   // Variable $variableed not defined.

Answer 2

也许一些例子可以解释括号和。运算符以连接字符串。

假设你有一个变量持有一些价值，比如$ money，你想显示这个数额。

$money=10;

print "you have earned $money"; // would output 'you have earned 10;
// ops missed the dollar sign as we are dealing with currency.
print "you have earned $$money"; // hmmm, that wont work $$ means something else.

因此，如果你有花括号，那么你可以告诉PHP你想要更清楚地将哪个变量替换成字符串。

print "you have earned ${$money}.00"; would now output 'you have earned $10.00'

现在看起来好多了。

{$ variable}如何在PHP中运行？

2 个答案: