How to jump from one Function to another in PHP Class - php

Question

I have a php script to pipe through a mail,
class mailTest
{
// (some code here)
private function saveToDb()
{
// (some code here)
$select = $this->pdo->query("SELECT * FROM tbl_reques WHERE terminal_id = $term AND request_status ='' ");
$select = $select->fetchAll();
if (count($select) > 0) {
echo "Call already Exist (DISCARD)";
} else {
$select_tech = $this->pdo->query("SELECT * FROM tbl_email WHERE terminal_id = $term");
$select_tech = $select_tech->fetchAll();
// (some code here)
}
}
private function sendEmail()
{
$this->today = time();
$this->maildate = date("Y-m-d H:i:s", strtotime('-5 minutes', $this->today));
$select = $this->pdo->query("Select * from tbl_reques WHERE maildate >= '$this->maildate' ");
// some code here
mail($this->from_email, $this->subject, $newmsg, $headers);
}
}
The problem is any time the condition is False i.e echo "Call already Exist (DISCARD)"; The code will not go to the Next Function. i.e the program get halt.
PLS is there a way that if that condition is not met, the program will JUMP to next function for continuation of execution. Or is it possible to use GOTO statement.
Pls what is the best way to handle this in PHP.
Thanks

Answer 1

You have a couple option for this. You can return at the point of failure. Which would exit the function at this point and then do whatever is next in the script being ran. Be sure to do the clean up before your return.
if(count($select) > 0) {
echo "Call already Exist (DISCARD)";
//Clean up if needed
return; //You could also return the message
//or an error code and have another
//evaluation based on that.
} else {
// Or passes
}
You could call the next function but this would be a very bad flow in my opinion
if(count($select) > 0) {
echo "Call already Exist (DISCARD)";
//Clean up if needed
$this->sendEmail();
} else {
// Or passes
}
The reason this would be bad is if say in the script you have
$mailTest = new mailTest();
$mailTest->saveToDb();
$mailTest->sendEmail(); //When the above fails this is called twice.
You could likewise throw an exception
if(count($select) > 0) {
echo "Call already Exist (DISCARD)";
throw new Exception("Call already Exist (DISCARD)");
} else {
// Or passes
}
Now you need to use try and catch
$mailTest = new mailTest();
try {
$mailTest->saveToDb();
catch (Exception $e){
//Do something with $e
//Clean up the failure if needed
}
$mailTest->sendEmail();
There is a finally block as well which would run in cases where your catch stops the script.

Answer 2

PHP in fact has a GOTO statement, see http://php.net/manual/de/control-structures.goto.php
However, it is considered bad style to use it, or in the words of #Konamiman
Unless you are programming in assembler, GOTO should always be treated the same way as the life vest of the airplanes: it is good to have them available, but if you need to use them it means that you are in big trouble.
You can call a function simply by writing its name followed by brackets. In the case of class functions you apply it to $this:
$this->sendEmail();