PHP 7.4 Warnings to PHP8.2 Errors

Enable E_WARNING and E_DEPRECATION Log in to the PHP error log and test your code.

1. Locate your php.ini file. The location can vary based on your operating system and PHP installation. Common paths include:

   • Windows: C:\Program Files\PHP\php.ini
   • Linux: /etc/php/{version}/apache2/php.ini

2. Open the php.ini file in a text editor with administrative privileges.

3. Search for the error_reporting directive.

4. Update the directive to include E_WARNING and E_DEPRECATED:

error_reporting = E_ALL & ~E_NOTICE | E_WARNING | E_DEPRECATED

PHP Warning: count(): Parameter must be an array or an object that implements Countable in *

• safeCount will take care of it

PHP Warning: A non-numeric value encountered*

• Occurs when invalid strings are coerced using operators expecting numbers (+ - * / ** % << >> | & ^) or their assignment equivalents.

• Cast the values to int or float before the arithmetic operation.

• Check the values for is_numeric($value) and skip the calculation if the values are not numeric.

PHP Warning: sizeof(): Parameter must be an array or an object that implements Countable in*

• if you have code like $a = sizeof($b) + 1;
• replace sizeof with safeCount

PHP Warning: strlen() expects parameter 1 to be string, array given in*

Add defensive for example:

if (is_string($some_value)) {
  $len = strlen($some_value);
} else { 
  // throw error or deal with your data
}

PHP Warning: array_key_exists(): The first argument should be either a string or an integer in*

• Add defensive for example:

if ((is_string($haystack) || is_numeric($haystack)) && array_key_exists($haystack, $myArray)) {
    // continue with your logic  
} else { 
    // throw error or deal with your data;
}

PHP Warning: strpos(): Empty needle in*

• Add defensive code, for example:

if (isset($haystack) && !empty($haystack) && isset($needle) && !empty($needle) && strpos($haystack, $needle, $offset)) {
   // continue with your logic
} else { 
   // throw error or deal with your data;
}

PHP Warning: array_intersect(): Expected parameter 1 to be an array, null given in*

• Add defensive for example:

if (is_array($array) && is_array($arrays)) {
   $intersect = array_intersect($array, $arrays);
} else { 
   // throw error or deal with your data;
}

PHP Warning: Creating default object from empty value*

• Add defensive for example:

// Option 1: Skip execution branch if the value is not an object
$a = BeanFactory::newBean('someweirdstuff');
if (!($a instanceof SugarBean)) {
  return;
}
$a->b = 'c';

// Option 2: In cases when the variable is used without being initialized - initialize it first
$a = new stdClass();
$a-> b = ‘c’;

PHP Warning: DateTime::diff() expects parameter 1 to be DateTimeInterface, null given*

PHP Warning: DateTime::setTimezone() expects parameter 1 to be DateTimeZone, string given

• Add defensive for example:

$date = new \DateTime();
if ($otherDate instanceof \DateTimeInterface) {
  $diff = $date->diff($otherDate);
}

PHP Warning: Division by zero

• Add defensive for example:

if ($rate != 0) {
  $result = $amount / $rate;
}

PHP Warning: Illegal offset type in isset or empty; PHP Warning: Illegal offset type

• Array keys can only be int or string. Float, boolean and null get converted transparently (though it may be signal that something went wrong), but arrays, objects and resources don’t.

• The solution is also defensive coding::

if (is_string($key) || is_int($key)) {
  $map[$key] = $value;
}

PHP Warning: Illegal string offset

• Array keys can only be int or string. Float, boolean and null get converted transparently (though it may be signal that something went wrong), but arrays, objects and resources don’t.

• The solution is also defensive coding::

$a = ‘some_string’;
if (is_array($a)) {
  var_dump($a[‘key’]);
}

PHP Warning: Use of undefined constant SOME_NAME - assumed 'SOME_NAME'

• This may have multiple causes, the most common is string literal, not wrapped in quotes.

• The solution is to wrap these to quotes:

$status = $row['status'];
$duration = $n . 'hours';

PHP Warning: fclose() expects parameter 1 to be resource, bool given

• The solution is defensive coding, but in case of resources it should be applied as close as possible to the place of its initialization

$file = fopen($name, 'r');
if ($file === false) {
    // handle error, interrupt execution - whatever appropriate
}
// do something
fclose($file);

PHP Warning: call_user_func() expects parameter 1 to be a valid callback, function 'my_func_name' not found or invalid function name

• The solution is also defensive coding:

if (is_callable('my_func_name')) {
    call_user_func('my_func_name');
} else {
    // handle error
}

PHP Warning: implode(): Invalid arguments passed

• Happens when the second argument is not array:

• The solution is also defensive coding:

if (is_array($names)) {
    var_dump(implode(', ', $names));
}

// or

$pieces = is_array($names) ? $names : [];
var_dump(implode(', ', $pieces));

PHP Warning: max(): Array must contain at least one element

• The solution is also defensive coding:

if (safeCount($items) > 0) {
    $best = max($items);
} else {
    // handle error, assign some defaults, etc.
}

PHP Warning: Attempt to assign property 'team_id' of non-object

• Defensive coding - check if the object is really an instance of the class you assuming. Makes sense to perform this check as close to object initialization as possible (or at the beginning of the function if the object is passed as an argument)

if (!($a instanceof SomeClass)) {
    // handle error, interrupt execution, etc.
}
$a->b = 1;

PHP Warning: array_multisort(): Array sizes are inconsistent*

PHP Warning: array_combine(): Both parameters should have an equal number of elements

• These warnings have similar cause and solution. Make sure, that sorted arrays are of the same size

if (safeCount($apples) !== safeCount($oranges)) {
    // handle error
}
array_multisort($apples, $oranges);

PHP Warning: array_multisort(): Argument #1 is expected to be an array or a sort flag

• Defensive coding. Assuming here that sorting flags and order are hardcoded, otherwise, check them with is_integer

if (!is_array($apples) || !is_array($oranges)) {
    // handle error
}
array_multisort($apples, SORT_ASC, SORT_STRING, $oranges, SORT_ASC, SORT_STRING);

PHP Warning: sprintf(): Too few arguments

• Carefully check that number of arguments to sprintf corresponds to number of placeholders in format string

echo sprintf('%s is the capital of %s', 'London'); // error - 2 placeholders but 1 argument