How to define the length of a string array in php

In PHP, defining the length of a string array can be achieved in the following ways:

1. Use the count() function

count() The function can count the number of elements in an array, including string arrays. Just pass the string array to the count() function to get the length of the array.

For example:

$str_arr = array("Hello", "world", "!");
$length = count($str_arr);
echo $length; //输出3

2. Use the sizeof() function

The sizeof() function has a similar function to the count() function, and can also count the values ​​in the array The number of elements. Different from the count() function, the sizeof() function can be used as an alias for the array name. You can obtain the length of the array by directly passing the string array.

For example:

$str_arr = array("Hello", "world", "!");
$length = sizeof($str_arr);
echo $length; //输出3

3. Use the strlen() function

The strlen() function can get the length of the string, but it cannot be directly applied to the string array. You can concatenate all the strings, add a delimiter at the end, and then use the strlen() function to calculate the length of the entire string. In this way, you can also get the total length of the string array.

For example:

$str_arr = array("Hello", "world", "!");
$str = implode("|", $str_arr) . "|"; //将所有字符串拼接起来，并在末尾添加分隔符
$length = strlen($str);
echo $length; //输出13

Summary:

The length of the string array can be obtained through three methods: count(), sizeof() and strlen(). The appropriate method should be selected based on actual needs. Among them, count() and sizeof() are more efficient than strlen(). If you only need to get the length of a string array, it is recommended to use the count() or sizeof() function.

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