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The atanh() function returns the inverse hyperbolic tangent of the specified number.Syntaxatanh(num)Parameters num − The specified number. Required.ReturnThe atanh() function returns a float value, which is the hyperbolic tangent of a number.Example Live DemoOutputINF-INFExampleLet us see another example − Live DemoOutput1.05930617082321.4722194895832-1.4722194895832ExampleLet us see another example − Live DemoOutput0
The atan2() function returns the arc tangent of two variables.Syntaxatan2(val1, val2)Parametersval1 − The dividendval2 − The divisorReturnThe atan2() function returns the arc tangent of val2/ val1 in radians. The returned value is between -Pi and Pi.Example Live DemoOutput0.785398163397450.78539816339745ExampleLet us see another example − Live DemoOutput-2.3561944901923-2.2318394956456
To merge two arrays keeping original keys in PHP, the code is as follows−Example Live DemoOutputThis will produce the following output−array(8) { ["p"]=> string(3) "150" ["q"]=> string(3) "100" ["r"]=> string(3) "120" ["s"]=> string(3) "110" ["t"]=> string(3) "115" ["u"]=> string(3) "103" ["v"]=> string(3) "105" ["w"]=> string(3) "125" }ExampleLet us now see another example − Live DemoOutputThis will produce the following output−array(1) { ["a"]=> string(5) "Jacob" }
PHP supports the error control operator i.e. the at sign (@). When @ is prepended to an expression, any error messages that might be generated by that expression gets ignored.To use @ symbol in PHP, the code is as follows−Example Live Demo
To convert an object to associative array in PHP, the code is as follows−Example Live DemoOutputThis will produce the following output−Before conversion: object(department)#1 (2) { ["deptname"]=> string(9) "Marketing" ["deptzone"]=> string(5) "South" } After conversion: array(2) { ["deptname"]=> string(9) "Marketing" ["deptzone"]=> string(5) "South" }ExampleLet us now see another example − Live DemoOutputThis will produce the following output−Before conversion: object(department)#1 (2) { ["deptname"]=> string(9) "Marketing" ["deptzone"]=> string(5) "South" } After conversion: array(2) { ["deptname"]=> string(9) "Marketing" ["deptzone"]=> string(5) "South" }
To change date format in PHP, the code is as follows−Example Live DemoOutputThis will produce the following output−Displaying date... Date = 2019-11-11 05:25 PM Displaying updated date... 2019-12-01 17:25ExampleLet us now see another example− Live DemoOutputThis will produce the following output−Displaying date... 2019/11/11 00:00:00
To add an item at the beginning of the associative array, the code is as follows−Example Live DemoOutputThis will produce the following output−Initial Array... Array( [p] => 150 [q] => 100 [r] => 120 [s] => 110 [t] => 115 [u] => 103 [v] => 105 [w] => 125 ) Updated Array... Array ( [0] => 100 [p] => 150 [q] => 100 [r] => 120 [s] => 110 [t] => 115 [u] => 103 [v] => 105 [w] => 125 )ExampleLet us now see another example− Live DemoOutputThis will produce the following output−Initial Array... Array( [0] => Ryan [1] => Kevin [2] => Jack ) Updated Array... Array( [0] => Katie [1] => Ryan [2] => Kevin [3] => Jack )
In the Double not operator (!!), the first not i.e. ! is used to negate a value, whereas the second not i.e.! again negates. To implement Double not operator in PHP, the code is as follows−Example Live DemoOutputThis will produce the following output−Value = 0.1 Double Negated Value = 1ExampleLet us now see another example − Live DemoOutputThis will produce the following output−String = 100.56 Number (Converted from String) = 100.56 Double Negated Value = 1
To convert a string into a number, the code is as follows−Example Live DemoOutputThis will produce the following output−Number (Converted from String) = 150ExampleLet us now see another example− Live DemoOutputThis will produce the following output−String = 100.56 Number (Converted from String) = 100.56
To convert number to month name in PHP, the code is as follows−Example Live DemoOutputThis will produce the following output−Displaying date... Date = 2019-11-11 Month = November Displaying updated date... 2019-12-01ExampleLet us now see another example − Live DemoOutputThis will produce the following output −Displaying date... Date = 2019-11-11 Month = November Displaying updated date... 2019-12-01 Month = December