Several methods for detecting data types in PHP (Summary) and several methods for data types

Several methods for detecting data types in PHP (Summary) and several methods for data types

In JavaScript, typeof can be used to detect basic data types, and instanceof can be used to detect referenced data types. In PHP, there are also methods for detecting data types, as shown below:

1. gettype)

<? Php $ arry = array ('A', 'B', 'C'); echo gettype ($ arry); // array?>

2. Data type, quantity, and content of the output variable (var_dump)

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<? Php $ str = 'Hello world'; var_dump ($ str); // string (11) "hello world"?>

3. check whether a variable is of the specified data type (is_array, is_string, is_int, is_double, etc.). If it is true, return 1. If it is false, return null.

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<? Php $ num = 123; if (is_array ($ num) {echo 'This is an array';} else if (is_string ($ num )) {echo 'This is a string';} else if (is_int ($ num) {echo 'This is an integer';} else if (is_double ($ num )) {echo 'this is a floating point number ';}?>

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