Why not work in case compare zero and one?

Question

Why not work in case compare zero and one?

55 views

Study, was given the task of not pre-specifying some of the details.
Explain the essence of the question in comments in the code

spoiler

<?php//объявляем переменные$peremennaya1=2; //присвоили числовое значение$peremennaya2=2; //присвоили числовое значение$peremennayapolz=$_GET['peremennayapolz']; // переменную должен задать пользовательswitch ($peremennayapolz) {case $peremennayapolz < $peremennaya1:  //  работает если пользователь задает значение переменной "1", а если задает значение "0" то почему то выводит значение, что переменная пользователя равна переменной1 (0=1) как???echo "Задуманное число не входит в числовой ряд";break;case $peremennaya1 == $peremennayapolz: // все работаетecho "Переменная пользователя равна переменной 1<br>"; break; case $peremennayapolz > $peremennaya1: // everything works echo "user Variable is greater"; break; case $peremennayapolz == null: // Google having studied and having estimated decided it would be necessary to check for variable value and it's not working. echo "Set variable"; break; } ?>

asked Apr 11, 2019 by chernousovkgb | 55 views

4 Answers

Related questions

0 like 0 dislike

2 answers

Why switch-case compare with if/else?

asked Apr 13, 2019 by Senseich

0 like 0 dislike

1 answer

How to compare arrays and replace in case of coincidence of the key?

asked May 2, 2019 by smartycms

0 like 0 dislike

1 answer

Is there a way to compare string values in js is case-insensitive?

asked Apr 9, 2019 by spacenear

0 like 0 dislike

1 answer

In array to count the number of rows with at least one zero? And how to make the inverse of the main diagonal of the matrix?

asked Jun 10, 2019 by madwayz1337

0 like 0 dislike

1 answer

How to compare values of one array with another?

asked Jun 3, 2019 by zevem

McBernar · Answer 1 · 2019-04-17T07:54:45+0000

Read ka php.net/manual/ru/control-structures.switch.php and note examples.

This statement compares the switch (what) and case (like here) between them. The use is simply not correct.

If $peremennayapolz you have zero, in the second case, a comparison of this zero with the result of the expression
$peremennaya1 == $peremennayapolz. The expression yields false, and false == 0.

As for me, it is better to rewrite the if elseif php.net/manual/ru/control-structures.elseif.php

As an option to cheat and write switch (true) ...

Yan-s · Answer 2 · 2019-04-17T07:54:45+0000

//declare variables $peremennaya1=2; //assigned numeric value $peremennaya2=2; //assigned numeric value if (isset($_GET['peremennayapolz'])){ $peremennayapolz = intval($_GET['peremennayapolz']); switch ($peremennayapolz) { case $peremennayapolz < $peremennaya1: echo "Conceived the number is not included in the numeric range"; break; case $peremennaya1 == $peremennayapolz: // everything works echo "Variable a user variable is equal to 1"; break; case $peremennayapolz > $peremennaya1: // everything works echo "user Variable is greater"; break; default: echo "Set variable"; break; } }

chernousovkgb · Answer 3 · 2019-04-17T07:54:45+0000

1. Type cast intval()
2. Comparison of types: php.net/manual/ru/types.comparisons.php

Yan-s · Answer 4 · 2019-04-17T07:54:45+0000

Case works on comparison sort.
Ie
switch ($peremennayapolz) {
case 1:
echo "Conceived the number is not included in the numeric range";
break;
case 2 // all works
echo "Variable a user variable is equal to 1";
break;
case 3: // all works
echo "user Variable is greater";
break;
default:
echo "Set variable";
break;
}
}
Then suddenly, the comparison in the place where should be the value?.... there will be either 0 or 1. (comparison result)

Why not work in case compare zero and one?

Please log in or register to add a comment.

Please log in or register to answer this question.

4 Answers

Please log in or register to add a comment.

Please log in or register to add a comment.

Please log in or register to add a comment.

Please log in or register to add a comment.

Related questions

Most popular tags