is null php
// The is_null() function checks whether a variable is NULL or not. This function returns true (1) if the variable is NULL, otherwise it returns false/nothing.
<?php
$var = NULL;
if (is_null($var)) {
echo "yes, is null";
} else {
echo "not null";
}
?>isset in php
/**
* Returns a bool (true or false)
*/
isset($x);
/**
* Examples
*/
$x = 'myValue';
if(isset($x)){
echo 'x is set';
}
/**
* this will echo out 'x is set'
*/
$x = null;
if(isset($x)){
echo 'x is set';
}
/**
* This will NOT echo out 'x is set'
*/
if(isset($y)){
echo 'y is set';
}
/**
* This will NOT echo out 'y is set'
*/error php
// how to display php errors on your browser :
// first step, create an error function :
$errors = array();
// now you have just to insert the function like this :
if (........){
$errors['the_name_of_the_error']='the error message';
}
// example :
// we want to display an error when the user does not correctly fill,
// in the 'password' box when registering on your website :
if(empty($_POST['password']) ||
$_POST['password'] != $_POST['password_confirm']){
$errors['errors']= "You must enter a valid password";
}Copyright © 2021 Codeinu
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