What are the use cases of the strval function in PHP?

1. Convert the numbers into strings in PHP, for example:

$num = 123;
$str = strval($num);
echo gettype($str); // 输出 string

1. Convert a boolean value to a string, for example:

$bool = true;
$str = strval($bool);
echo gettype($str); // 输出 string

1. Convert an array or object into a string, for example:

$array = array('a', 'b', 'c');
$str = strval($array);
echo $str; // 输出 Array

1. Convert NULL to a string, for example:

$null = null;
$str = strval($null);
echo gettype($str); // 输出 string

1. When concatenating strings, you can use strval to convert non-string types to strings, for example:

$num = 123;
$str = 'The number is ' . strval($num);
echo $str; // 输出 The number is 123

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