PHP大括號和字符串

Question

任何人都可以向我解釋如何在PHP字符串中使用大括號{}。像

"this is a {$variable}"
"this is a {$user -> getName($variable);} name"

Answer 1

如果遇到美元符號（$），解析器會貪婪地採取儘可能多的令牌，儘可能形成一個有效的變量名。將變量名稱括在花括號中以明確指定名稱的結尾。

<?php 
$beer = 'Heineken'; 
echo "$beer's taste is great"; // works; "'" is an invalid character for variable names 
echo "He drank some $beers"; // won't work; 's' is a valid character for variable names but the variable is "$beer" 
echo "He drank some ${beer}s"; // works 
echo "He drank some {$beer}s"; // works 
?> 

Source

Answer 2

它用於指定變量名的末尾，例如：

$var = "apple"; 

echo "I love $var!"; //I love apple! 
echo "I love $vars!"; // I love ! 
echo "I love {$var}s!"; //I love apples! 
echo "I love ${var}s!"; //I love apples! //same as above 

Answer 3

另外的語法「這是一個{$用戶 - >的getName（$變量） ;} name「無效。你不能在字符串中調用函數/方法。你可以這樣做：

"this is a " . $user->getName($varaible) . " name"