本文介绍了PHP中.=和+ =有什么区别?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
.=和+ =在PHP中有什么区别?
What are the differences between .= and += in PHP?
推荐答案
很简单，"+ ="是数字运算符，而.="是字符串运算符.考虑以下示例:
Quite simply, "+=" is a numeric operator and ".=" is a string operator. Consider this example:
$a = 'this is a ';
$a += 'test';
这就像写作:
$a = 'this' + 'test';
"+"或"+ ="运算符首先将值转换为整数(当转换为int时，所有字符串求值为零)，然后将它们相加，因此得到0.
The "+" or "+=" operator first converts the values to integers (and all strings evaluate to zero when cast to ints) and then adds them, so you get 0.
如果您这样做:
$a = 10;
$a .= 5;
这与写作相同:
$a = 10 . 5;
自." operator是一个字符串运算符，它首先将值转换为字符串；并且因为."表示连接"，结果是字符串"105".
Since the "." operator is a string operator, it first converts the values to strings; and since "." means "concatenate," the result is the string "105".
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