PHP syntax for if / elseif / else but for 4 conditions - php

Question

I need to implement 3 'if conditions' in my script, i've looked it up online but I can only find solutions up to 2 if's like below
<?
if (condition 1){
do something;
}
elseif (condition 2){
do something else;
}
else {
do this last;
}
?>
but I would need something like this:
if (condition 1) { do this };
else if (condition 2) {do that};
or else if (condition 3) {do that};
else (do this)
How do I go about this?

Answer 1

simply
if(condition){
}
else if(condition){
}
else if(condition){
}
else{
}
you can use switch case statements too. you can use else if as many as you want. Each condition inside if() can accept OR and AND operators as || for OR and && for AND you can use.

Answer 2

if (condition 1) { do this
} else if (condition 2) {do that
} else if (condition 3) {do that
} else { do this }
alternatively if you want to check one variable each time you can use a switch for example
$myvar = 5;
switch($myvar){
case 1:
//do this
break;
case 2:
//do that
break;
case 3:
//do that
break;
default:
//do this
}

Answer 3

You can use this construction
if ( $a == $b ) {
// something...
} else if ( $a == $c ) {
// something...
} else if ( $a == $d ) {
// something...
} else {
// otherwise...
}
But if all of the conditions are ( $a equals to something ) it's better to use switch ... case:
switch ( $a ) {
case $b:
// something...
break;
case $c:
// something...
break;
case $d:
// something...
break;
default:
// otherwise...
break;
}

Answer 4

Solution 1
Using many elseif statements as you want.
Use this solution when your conditions are complex, or comparing different variables.
if (/*condition 1*/) {
// Action to condition 1
} else if (/*condition 2*/) {
// Action to condition 2
} else if (/*condition 3*/) {
// Action to condition 3
} else if (/*condition n*/) {
// Action to condition n
} else {
// Action when no conditions match.
}
Solution 2
Using switch statement:
Use this condition when you want to compare a variable against constant values:
switch ($age) {
case 0:
return 'You are a baby';
break;
case 18:
return 'You are 18 years old';
break;
case 21:
case 22:
case 23:
return 'You are too old';
default:
return 'Unexpected age :(';
}

Answer 5

How about using the or operator, ||:
if (condition 1) { do this }
else if (condition 2 || condition 3) {do that}
else {do this}
An example:
<?php
function testCondition($a, $b) {
if ($a == $b) {
print ("They are the same<br />\n");
}
else if ($a == "a" || $b == "b") {
print ("One is the same as its letter<br />\n");
}
else {
print ("They are some other sort<br />\n");
}
}
testCondition("c","c");
testCondition("a","c");
testCondition("a","b");
testCondition("d","e");
?>
Outputs:
They are the same
One is the same as its letter
One is the same as its letter
They are some other sort

Answer 6

I have the same problem as first stated here. I have four variables but the second one is skipped and only 1,3, and 4 work. Why?
if(empty($fromName) or empty($fromEmail) or empty($subject) or empty($comments)) {
echo 'You cannot submit the form with empty fields. Please correct the form and resubmit.';
return false;
}
elseif($fieldDelete == "Delete this text!"){
echo "Delete the contents of the fourth field before submitting.";
return false;
}
elseif (($fromName == "Curtisvien") || ($fromName == "Thomastymn") || ($fromName == "RichardMark")) {
echo "Failed. Please try again.";
return false;
}
else {
$flgchk = mail ("$to", "$subject", "$message", "$headers");
$imgfile = "images/NatMap logo2.gif";
$handle = fopen($filename, "r");
$imgbinary = fread(fopen($imgfile, "r"), filesize($imgfile));
echo '<img src="data:image/gif;base64,' . base64_encode($imgbinary) . '" width=427 height=72 />';
echo "\n<br />\n<br />Thank You! An e-mail has been sent to the National Map web team and they will get back to you in the next 24-48 hours.";
}`enter code here`