Do not display Warning de foreach

Question

Example, I have 2 warnings:

ksort($var);
foreach($var as $v)...;

Warning: ksort() expects Parameter 1 to be array, integer Given in C: www teste.php on line 15 Warning: Invalid argument supplied for foreach() in C: www test.php on line 30

Not to print the Warning of ksort(), simply add "@" (getting @ksort()) and fix me.

But in the foreach, if I do this, @foreach, he returns error:

Parse error: syntax error, Unexpected 'foreach' (T_FOREACH) in C: www test.php on line 30

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• Why does this happen?
• What would be the options to not print Warning of a foreach specific?

Answer 1

The @ in the foreach issues the error:

Parse error: syntax error, Unexpected 'foreach' (T_FOREACH) in C: www test.php on line 30

for that is a "syntax error", i.e., in the parse of the language, see that even in a right script the error occurs:

• https://ideone.com/gydCXF

The foreach is not a function, it is part of the syntax of the language, for the interpreter this has no sense of what you are doing, ie after the @ something else was expected but he came across the foreach and the message says "foreach not expected (T_FOREACH)"

For example, this would also be wrong for the syntax:

(foreach (range(1, 10) as $value) {
     var_dump($value);
});

Behold: https://ideone.com/fdcxoU - the same error is issued

The foreach is part of the instruction of language, as while, switch, for and if, see an example with if:

<?php
@if ($foo) echo 1;

This causes a similar error:

PHP Parse error: syntax error, Unexpected 'if' (T_IF)

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On suppressing warnings and errors with arroba @

Keep in mind that function ksort does not return iterable (does not return an array or eternal object) it returns boolean, as documented http://php.net/manual/en/function.ksort.php:

bool ksort ( array &$array [, int $sort_flags = SORT_REGULAR ] )

Another thing, don’t print on the screen the Warning does not mean that it did not occur, the @ it’s just like putting up a curtain so no one can see what you’re doing behind it, the behavior doesn’t change at all internally, it’s just hidden, but still the script is flawed and will trigger errors.

Namely the @ is only to suppress, but does not mean that it does not occur, in fact it is quite useless in my opinion, for many cases display_errors=Off in the php.ini would solve already, recommend you read these links in order:

• What is the function of '@' (arroba) at the beginning of PHP expressions
• Why do they say using @arroba to suppress errors is a bad practice?
• Why use error_reporting with display_errors and display_startup_errors?

Answer 2

In addition to all problems associated with the use of @already cited in the reply of @Guilhermenascimento, PHP documentation is clear where the error control operator can be used @:

Note: The @ operator works on expressions. A rule simple to remember this: if you can take the value of some thing, you can prefix this with @. So, you can prefix calls for variables, functions and includes, constants and the like. You cannot prefix function or class definitions, conditional structures like if, foreach and so on. (griffin mine)

That is, it is simply something of the language. It cannot be used @ with conditional structures, so this represents a syntax error for the parser of PHP.

As an "outline" (a gambiarra, go), I imagine you can close your foreach in a function and then call the function with @. The syntax of foreach will be correct and, as the function call is an expression, any errors contained in it should be deleted.

Answer 3

Despite old topic, I will leave my solution to the problem presented. It has already been explained why of the error and etc etc etc

The solution to the problem of not generating the warning :

<?php

error_reporting(0);

Source: https://www.php.net/manual/en/function.error-reporting