For this, use clone along with set the property name to null.ExampleThe PHP code is as follows Live Demo OutputThis will produce the following outputobject(stdClass)#1 (2) { ["Name"]=> string(4) "John" ["Age"]=> int(20) } object(stdClass)#2 (2) { ["Name"]=> string(4) "John" ["Age"]=> int(20) } object(stdClass)#2 (2) { ["Name"]=> NULL ["Age"]=> NULL } object(stdClass)#1 (2) { ["Name"]=> NULL ["Age"]=> NULL }

For this, you can simply use for loop.ExampleThe PHP code is as follows Live Demo OutputThis will produce the following output10 20 30 40 50 60

For such conditional evaluation, use PHP if(), else if() and else.ExampleThe PHP code is as follows Live Demo OutputGAME IS IN BUY MODE

Let’s say the following is our array −$marks=[45,67,89,34,98,57,77,30];And we want the output like this with only selected values45 67 89 68 98 57 77 60Above, we multiplied marks less than 40 with 2, rest kept the entire array same.ExampleThe PHP code is as follows Live Demo OutputThis will produce the following outputThe Marks are as follows 45 67 89 68 98 57 77 60

Let’s say the following is our string with letters and numbers −$value ="1045632245555fghjklm67535454663443gfdjkbvc9890000006777743";We ant a specific value beginning from 989 i.e.−9890000006777743ExampleFor this, use substr() along with strpos(). Live Demo OutputThe actual value is=1045632245555fghjklm67535454663443gfdjkbvc9890000006777743 The filter value is=9890000006777743

To generate random number in PHP, use rand(). Let’s say the following is our input −$storedValue ='0123456789';And we want to display a random value from the above values.Example Live Demo OutputThis will produce the following outputThe random value=3

The syntax is as follows −$anyVariableName=yourCondition ? if condition becomes true then this will be executed: if condition becomes false then this gets executed;ExampleThe PHP code is as follows Live Demo OutputThis will produce the following outputGreater Than or Equal to 100

To add backslash inside array of strings, use json_encode().Let’s say the following is our array −$value = [    "ADD", "REMOVE","SELECT","MODIFY" ];We want the output with backslash inside array of strings i.e −"[\"ADD\",\"REMOVE\",\"SELECT\",\"MODIFY\"]"ExampleThe PHP code is as follows − Live Demo OutputThis will produce the following output"[\"ADD\",\"REMOVE\",\"SELECT\",\"MODIFY\"]"

If you want to remove extra whitespace from the beginning, use ltrim() in PHP. Let’s say the following is our variable −$value="  Hello, welcome to PHP Tutorial  ";We want the output with no whitespace on the left −Hello, welcome to PHP TutorialExample Live Demo OutputThis will produce the following outputThe actual value is= Hello, welcome to PHP Tutorial The actual length is=34 After removing extra whitespace from beginning=32 The result is=Hello, welcome to PHP Tutorial

Yes, change the date format in PHP using the date() along with strtotime(). Let’s say the following is our date −$dateValue = "2020-09-19";Change the date format using the strtotime() method −$modifiedDate= date("d-m-Y", strtotime($dateValue));  Example Live Demo OutputThis will produce the following outputThe original date format is=2020-09-19 The changed date format is= 19-09-2020