我很好奇如何访问包含空格或特殊字符的变量。
有什么办法吗？
<?php
$first_day = "monday";
$$first_day = "first day of the week";
echo $monday." <br />";
$days = 'saturday sunday';
$$days = 'days of the weekend';
// how to echo $days of the weekend ???
print_r(get_defined_vars());
最佳答案
根据PHP docs :
A valid variable name starts with a letter or underscore, followed by any number of letters, numbers, or underscores. As a regular expression, it would be expressed thus: '[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*'
也就是说，严格来说，包含空格或特殊字符的变量名称不是有效的变量名称。
话虽这么说，@mario 的评论提供了解决方法:
echo ${'saturday sunday'}; // echoes 'days of the weekend'
关于php - 如何访问有空格的变量？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/32339411/