yiisoft/yii2

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framework/base/Response.php

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Remove error control operator '@' on line 41.
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    public function clearOutputBuffers()
    {
        // the following manual level counting is to deal with zlib.output_compression set to On
        for ($level = ob_get_level(); $level > 0; --$level) {
            if (!@ob_end_clean()) {
Severity: Minor
Found in framework/base/Response.php by phpmd

ErrorControlOperator

Error suppression should be avoided if possible as it doesn't just suppress the error, that you are trying to stop, but will also suppress errors that you didn't predict would ever occur. Consider changing error_reporting() level and/or setting up your own error handler.

Example

function foo($filePath) {
    $file = @fopen($filPath); // hides exceptions
    $key = @$array[$notExistingKey]; // assigns null to $key
}

Source http://phpmd.org/rules/cleancode.html#errorcontroloperator

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