headers_sent

Supported Versions: PHP 4, PHP 5, PHP 7, PHP 8
Checks if or where headers have been sent
<?php headers_sent(string &$filename = null, int &$line = null): bool
<?php }



if ($issues) {

    if (!headers_sent()) {

        header('HTTP/1.1 500 Internal Server Error');

    }

    if (!ini_get('display_errors')) {
<?php     if (!ini_get('display_errors')) {

        if (PHP_SAPI === 'cli' || PHP_SAPI === 'phpdbg') {

            fwrite(STDERR, 'Composer detected issues in your platform:' . PHP_EOL.PHP_EOL . implode(PHP_EOL, $issues) . PHP_EOL.PHP_EOL);

        } elseif (!headers_sent()) {

            echo 'Composer detected issues in your platform:' . PHP_EOL.PHP_EOL . str_replace('You are running '.PHP_VERSION.'.', '', implode(PHP_EOL, $issues)) . PHP_EOL.PHP_EOL;

        }

    }
<?php }



if ($issues) {

    if (!headers_sent()) {

        header('HTTP/1.1 500 Internal Server Error');

    }

    if (!ini_get('display_errors')) {
<?php     if (!ini_get('display_errors')) {

        if (PHP_SAPI === 'cli' || PHP_SAPI === 'phpdbg') {

            fwrite(STDERR, 'Composer detected issues in your platform:' . PHP_EOL.PHP_EOL . implode(PHP_EOL, $issues) . PHP_EOL.PHP_EOL);

        } elseif (!headers_sent()) {

            echo 'Composer detected issues in your platform:' . PHP_EOL.PHP_EOL . str_replace('You are running '.PHP_VERSION.'.', '', implode(PHP_EOL, $issues)) . PHP_EOL.PHP_EOL;

        }

    }
<?php }



if ($issues) {

    if (!headers_sent()) {

        header('HTTP/1.1 500 Internal Server Error');

    }

    if (!ini_get('display_errors')) {
<?php     if (!ini_get('display_errors')) {

        if (PHP_SAPI === 'cli' || PHP_SAPI === 'phpdbg') {

            fwrite(STDERR, 'Composer detected issues in your platform:' . PHP_EOL.PHP_EOL . implode(PHP_EOL, $issues) . PHP_EOL.PHP_EOL);

        } elseif (!headers_sent()) {

            echo 'Composer detected issues in your platform:' . PHP_EOL.PHP_EOL . str_replace('You are running '.PHP_VERSION.'.', '', implode(PHP_EOL, $issues)) . PHP_EOL.PHP_EOL;

        }

    }
<?php }



if ($issues) {

    if (!headers_sent()) {

        header('HTTP/1.1 500 Internal Server Error');

    }

    if (!ini_get('display_errors')) {
<?php     if (!ini_get('display_errors')) {

        if (PHP_SAPI === 'cli' || PHP_SAPI === 'phpdbg') {

            fwrite(STDERR, 'Composer detected issues in your platform:' . PHP_EOL.PHP_EOL . implode(PHP_EOL, $issues) . PHP_EOL.PHP_EOL);

        } elseif (!headers_sent()) {

            echo 'Composer detected issues in your platform:' . PHP_EOL.PHP_EOL . str_replace('You are running '.PHP_VERSION.'.', '', implode(PHP_EOL, $issues)) . PHP_EOL.PHP_EOL;

        }

    }
<?php }



if ($issues) {

    if (!headers_sent()) {

        header('HTTP/1.1 500 Internal Server Error');

    }

    if (!ini_get('display_errors')) {
<?php     if (!ini_get('display_errors')) {

        if (PHP_SAPI === 'cli' || PHP_SAPI === 'phpdbg') {

            fwrite(STDERR, 'Composer detected issues in your platform:' . PHP_EOL.PHP_EOL . implode(PHP_EOL, $issues) . PHP_EOL.PHP_EOL);

        } elseif (!headers_sent()) {

            echo 'Composer detected issues in your platform:' . PHP_EOL.PHP_EOL . str_replace('You are running '.PHP_VERSION.'.', '', implode(PHP_EOL, $issues)) . PHP_EOL.PHP_EOL;

        }

    }
<?php }



if ($issues) {

    if (!headers_sent()) {

        header('HTTP/1.1 500 Internal Server Error');

    }

    if (!ini_get('display_errors')) {
<?php     if (!ini_get('display_errors')) {

        if (PHP_SAPI === 'cli' || PHP_SAPI === 'phpdbg') {

            fwrite(STDERR, 'Composer detected issues in your platform:' . PHP_EOL.PHP_EOL . implode(PHP_EOL, $issues) . PHP_EOL.PHP_EOL);

        } elseif (!headers_sent()) {

            echo 'Composer detected issues in your platform:' . PHP_EOL.PHP_EOL . str_replace('You are running '.PHP_VERSION.'.', '', implode(PHP_EOL, $issues)) . PHP_EOL.PHP_EOL;

        }

    }
<?php }



if ($issues) {

    if (!headers_sent()) {

        header('HTTP/1.1 500 Internal Server Error');

    }

    if (!ini_get('display_errors')) {
<?php     if (!ini_get('display_errors')) {

        if (PHP_SAPI === 'cli' || PHP_SAPI === 'phpdbg') {

            fwrite(STDERR, 'Composer detected issues in your platform:' . PHP_EOL.PHP_EOL . implode(PHP_EOL, $issues) . PHP_EOL.PHP_EOL);

        } elseif (!headers_sent()) {

            echo 'Composer detected issues in your platform:' . PHP_EOL.PHP_EOL . str_replace('You are running '.PHP_VERSION.'.', '', implode(PHP_EOL, $issues)) . PHP_EOL.PHP_EOL;

        }

    }
<?php     function dd(...$vars)

    {

        if (!in_array(\PHP_SAPI, ['cli', 'phpdbg'], true) && !headers_sent()) {

            header('HTTP/1.1 500 Internal Server Error');

        }