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

composer/composer

<?php }



if ($issues) {

    if (!headers_sent()) {

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

    }

    if (!ini_get('display_errors')) {

tests/Composer/Test/Autoload/Fixtures/platform/no_extensions_required.php

composer/composer

<?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;

        }

    }

tests/Composer/Test/Autoload/Fixtures/platform/no_extensions_required.php

composer/composer

<?php }



if ($issues) {

    if (!headers_sent()) {

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

    }

    if (!ini_get('display_errors')) {

tests/Composer/Test/Autoload/Fixtures/platform/no_php_required.php

composer/composer

<?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;

        }

    }

tests/Composer/Test/Autoload/Fixtures/platform/no_php_required.php

composer/composer

<?php }



if ($issues) {

    if (!headers_sent()) {

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

    }

    if (!ini_get('display_errors')) {

tests/Composer/Test/Autoload/Fixtures/platform/no_php_upper_bound.php

composer/composer

<?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;

        }

    }

tests/Composer/Test/Autoload/Fixtures/platform/no_php_upper_bound.php

composer/composer

<?php }



if ($issues) {

    if (!headers_sent()) {

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

    }

    if (!ini_get('display_errors')) {

tests/Composer/Test/Autoload/Fixtures/platform/replaced_provided_exts.php

composer/composer

<?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;

        }

    }

tests/Composer/Test/Autoload/Fixtures/platform/replaced_provided_exts.php

composer/composer

<?php }



if ($issues) {

    if (!headers_sent()) {

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

    }

    if (!ini_get('display_errors')) {

tests/Composer/Test/Autoload/Fixtures/platform/specific_php_release.php

composer/composer

<?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;

        }

    }

tests/Composer/Test/Autoload/Fixtures/platform/specific_php_release.php

composer/composer

<?php }



if ($issues) {

    if (!headers_sent()) {

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

    }

    if (!ini_get('display_errors')) {

tests/Composer/Test/Autoload/Fixtures/platform/typical.php

composer/composer

<?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;

        }

    }

tests/Composer/Test/Autoload/Fixtures/platform/typical.php

composer/composer

<?php }



if ($issues) {

    if (!headers_sent()) {

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

    }

    if (!ini_get('display_errors')) {

tests/Composer/Test/Fixtures/functional/installed-versions2/vendor/composer/platform_check.php

composer/composer

<?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;

        }

    }

tests/Composer/Test/Fixtures/functional/installed-versions2/vendor/composer/platform_check.php

symfony/var-dumper

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

    {

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

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

        }

Resources/functions/dump.php