How check variable is empty or not in php?
Topic: PHP / MySQLPrev|Next Show Answer: Use the PHP empty() functionYou can use the PHP Let's try out the following example to understand how this function basically works:
Note: The Related FAQHere are some more FAQ related to this topic:
(PHP 4, PHP 5, PHP 7, PHP 8) empty — Determine whether a variable is empty Descriptionempty(mixed Parametersvar Variable to be checked No warning is generated if the variable does not exist. That means empty() is essentially the concise equivalent to !isset($var) || $var == false. Return Values Returns ExamplesExample #1 A simple empty() / isset() comparison.
Example #2 empty() on String Offsets
The above example will output: bool(true) bool(false) bool(false) bool(false) bool(true) bool(true) Notes
See Also
Nanhe Kumar ¶ 8 years ago
$testCase as $k => $v) { Janci ¶ 13 years ago
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"Time taken: " . (microtime(true) - $ts) . " sec\n"; your dot brother dot t at hotmail dot com ¶ 7 years ago
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$var); wranvaud at gmail dot com ¶ 5 years ago
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$testCase as $key => $case ) {
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$testCase as $k => $v) { GazetteSDF ¶ 4 years ago
Javier Alfonso ¶ 6 years ago
$a['key'])?'A empty':'A not empty'), ' - ', (empty($b['key'])?'B empty':'B not empty'), ' - ', (empty($c['key'])?'C empty':'C not empty'), ' - ', (empty($d['key'])?'D empty':'D not empty'); xzero at elite7hackers dot net ¶ 5 years ago
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class EmptyClass { Is NULL or empty PHP?is_null() The empty() function returns true if the value of a variable evaluates to false . This could mean the empty string, NULL , the integer 0 , or an array with no elements. On the other hand, is_null() will return true only if the variable has the value NULL .
How do you know if a variable has no value?Answer: Use the equality operator ( == )
In simple words you can say a null value means no value or absence of a value, and undefined means a variable that has been declared but no yet assigned a value.
Is empty string in PHP?To check if string is empty in PHP, get the length of the string and verify if it is zero. The length of an empty string is zero. strlen() returns zero if the string is empty, else it returns an integer representing number of characters in the string.
How do you check array is empty or not PHP?Using count Function: This function counts all the elements in an array. If number of elements in array is zero, then it will display empty array. ... . Using sizeof() function: This method check the size of array. If the size of array is zero then array is empty otherwise array is not empty.. |