Knowledge Base Ever

The use of the @symbol of the PHP language

2019-11-22 02:04:37

label: PHP, at-symbol, Error Control Operator, Error suppression operator

The AT symbol @ is an error suppression operator in PHP. If an expression starts with @, the error message generated by this expression will be ignored. If track_errors is turned on, the error message generated by the expression will be saved to the variable $php_errormsg, which will be overwritten every time an error occurs.
// PHP

// Read File error.
$file_name = @file ('no_file_found') or die ("Failed to open the file. Error Message: '$errormsg'"); 
// Get value from array
// It will not display notice if the $key does not exist.
$value = @$arr[$key];


CentOS7 CentOS PHP Linux Python3 Python MySQL MariaDB YUM JavaScript mysql_native_password PHP7 CSS Redis MySQL8 caching_sha2_password HTML CodeIgniter font-size root Tag Cloud apache httpd dual network interfaces Laravel ss5 CURLFille horiz-align node.js ShadowsocksR vertical-align BarManager exec mb_substr PyCharm SUBDATE date add IntelliJIDEA PEAR SOCKS5 Proxy Server WebStorm Chrome find remi Tag Apache du jQuery PHP5.5 src cURL hide nginx Shadowsocks-Python V2Ray availability eth0 MariaDB10.4 PostgreSQL sub folder date Install MongoDB pdo_sqlsrv SOCKS5 Web Server File Upload mssql-tools register_shutdown_function Symfony ADDDATE DevExpress JetBrain php-fpm sqlsrv Zend Framework height network interface Shadowsocks-Libev unixODBC-devel Aura error_get_last Port 80 string data INDENTIFIED BY password policy requirements SOCKS Web Development Fedora Media Writer msodbcsql Redis5 SVN absolute Deepin jemalloc SQLAlchemy convert FuelPHP mysqlclient Shadowsocks toggle at-symbol Error Control Operator margin PHPUnit Framework ss5.passwd daemon process IIS password SOCKET vps center Fatal Errors MongoDB4 sudoers .htaccess DATE_SUB Phalcon SQL Server 2017 WiFi Compiling PHP frequency conflict set_error_handler TestCase apr Elasticsearch7.3 PHPUnit ss5.conf daemon HTTP particles.js Slim Vincent Garreau Failed to build these modules: _uuid MongoDB Sudo DATE_ADD ip command pg_bha.conf SQL Server width Compiling Apache Frameworks MySQL-python scrollbar Tcp BBR Apache2.4 Elasticsearch libpython3.7m.so.1.0 PHPStorm ss5-3.8.9 CURLOPT_POSTFIELDS NodeJs show VIM Bluetooth Failed to build these modules: _ctypes Minimal ISO substr date sub INTERVAL PECL SQL Date Funcitons Wi-Fi