Catch true statement from if condition with multiple statements - php

Question

Is there a way to get the true statement from $this if condition:
$a = 1;
$b = 3;
$c = 7;
if ($a == 3 || $b == 4 || $c == 7) {
echo "The true statement was: ";
}
I expect to get this output:
The true statement was: 7
Is it possible to do this in PHP?
Or better to say how can i check which statement has triggered the if condition?

Answer 1

You can't without multiple conditions. Whatever answer you will get here eg:
Inline if statements
Wrap in a function
Condition result assignment in the condition
Switch
Loops
etc. Will always require you to have multiple conditions.
If you don't mind multiple conditions and just looking for most elegant way to write it, thats another question and we can help.

Answer 2

This can only ever show 1 true statement because of how the if works:
$a = 1;
$b = 3;
$c = 7;
if (($t = $a) ==3 || ($t = $b) == 4 || ($t=$c) == 7) {
echo "The true statement was: $t";
}
What happens here is it sets $t to each variable and then checks if the assignment result (which is the value) was successful. Since this is an || then it stops at the first success and so $t will have the last compared value.

Answer 3

Try this.
<?php
$day = 1;
$month = 3;
$year = 2017;
$str = "The true statements are: " . ($day == 3 ? "$day, " : "") . ($month == 4 ? "$month, " : "") . ($year == 2017 ? "$year, " : "");
echo substr($str, 0, strlen($str) - 2);
?>
If I understand correctly, this should work.
The strlen($str) -2 is to remove the trailing ", ".

Answer 4

Here is a solution with boolean variables:
$day = 1;
$month = 3;
$year = 2017;
$cday = $day == 3;
$cmonth = $month == 4;
$cyear = $year == 2017;
if ($cday || $cmonth || $cyear) {
echo "The true statements are: ";
if($cday) echo "$day<br>\n";
if($cmonth) echo "$month<br>\n";
if($cyear) echo "$year<br>\n";
}

Answer 5

This might help -
// actual values
$day = 1;
$month = 3;
$year = 2017;
// values & variable names to check
$checks = array(
'day' => 1,
'month' => 4,
'year' => 2017,
);
// Loop through the checks
foreach($checks as $check => $value) {
// compare values
if($$check == $value) {
// output and stop looping
echo "The true statement was: $check -> $value";
break;
}
}
Demo