PHP: count() function
PHP: Count all elements in an array
The count() function is used to count the elements of an array or the properties of an object.
Note: For objects, if you have SPL installed, you can hook into count() by implementing interface Countable. The interface has exactly one method, Countable::count(), which returns the return value for the count() function.
(PHP 4 and above)
|array_name||Specifies the array or object to count.||Required||Array|
|mode||Sets the mode of the function.
Possible values :
COUNT_RECURSIVE (or 1) : here the count() function counts the array recursively. This is useful for counting all the elements of a multidimensional array.
The default value is 0.
The number of elements in array_name.
Value Type: Array.
Note: The count() function may return 0 for a variable which is not set, but it may also return 0 for a variable that has been initialized with an empty array.
The isset() function should be used to test whether a variable is set or not.
<?php $a = 'Language'; $a = 'English'; $a = 'Math'; $a = 'Science'; $result = count($a); echo $result; ?>
Practice here online :
PHP: Tips of the Day
PHP: How to convert string to boolean?
Strings always evaluate to boolean true unless they have a value that's considered "empty" by PHP (taken from the documentation for empty):
- "" (an empty string);
- "0" (0 as a string)
If you need to set a boolean based on the text value of a string, then you'll need to check for the presence or otherwise of that value.
$test_mode_mail = $string === 'true'? true: false;
EDIT: the above code is intended for clarity of understanding. In actual use the following code may be more appropriate:
$test_mode_mail = ($string === 'true');
or maybe use of the filter_var function may cover more boolean values:
filter_var covers a whole range of values, including the truthy values "true", "1", "yes" and "on".
Ref : https://bit.ly/33SQ3eP
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