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How to delete an array element based on key in PHP?
To delete an array element based on a key in PHP, the code is as follows−
Example
<?php $arr = array( " John ", "Jacob ", " Tom ", " Tim "); echo "Array with leading and trailing whitespaces...
"; foreach( $arr as $value ) { echo "Value = $value
"; } echo "
Comma separated list...
"; print_r(implode(', ', $arr)); $result = array_map('trim', $arr); echo "
Updated Array...
"; foreach( $result as $value ) { echo "Value = $value
"; } unset($result[1]); echo "
Updated Array...
"; foreach( $result as $value ) { echo "Value = $value
"; } ?>
Output
This will produce the following output−
Array with leading and trailing whitespaces... Value = John Value = Jacob Value = Tom Value = Tim Comma separated list... John , Jacob , Tom , Tim Updated Array... Value = John Value = Jacob Value = Tom Value = Tim Updated Array... Value = John Value = Tom Value = Tim
Example
Let us now see another example −
<?php $marks = array( "kevin" => array ( "physics" => 95, "maths" => 90, ), "ryan" => array ( "physics" => 92, "maths" => 97, ), ); echo "Marks for kevin in physics : " ; echo $marks['kevin']['physics'] . "
"; echo "Marks for ryan in maths : "; echo $marks['ryan']['maths'] . "
"; unset($marks["ryan"]); echo "Marks for ryan in maths : "; echo $marks['ryan']['maths'] . "
"; ?>
Output
This will produce the following output. Now, an error would be visible since we deleted the element and trying to access it−
Marks for kevin in physics : 95 Marks for ryan in maths : 97 Marks for ryan in maths : PHP Notice: Undefined index: ryan in /home/cg/root/6985034/main.php on line 25
Updated on: 27-Dec-2019
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