Beginning programmers quickly discover that the textual representation of a number differs distinctly from a numeric variable on which programs can perform mathematical operations.

早期的程序员们很快发现了数字的文本表示与程序能在上面执行数学运算的数字变量显著不同。

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This speedup is due to the fact that the array is a fixed size, not a variable-sized one like the default PHP one is, and that non-numeric indexes are not allowed.

造成这种速度优势的原因是数组是固定大小的，而默认的 PHP 数组是可变大小的，并且不允许非数值型索引。

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The value you specify with a parameter can be a free-form string, a number (including specialized numeric values, such as IP addresses), a Boolean value, a variable, or a list.

您指定的参数Value可以是自由格式的字符串、数字(包括特殊数值，如IP地址)、boolean值、变量或列表。

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