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                <?php  | 
            
                            
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                namespace Tests\Compiling\Statements;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class DeprecatedIniOptions  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function testIniSet()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        ini_set("asp_tags", "1"); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function testIniAlter()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        ini_alter("mbstring.http_input", "pass"); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function testIniGet()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        ini_get("highlight.bg"); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    public function testIniRestore()  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        ini_restore("safe_mode"); | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function testOtherFunction()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        htmlspecialchars("asp_tags"); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                ?>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                ----------------------------  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                [  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        "type":"deprecated.option",  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        "message":"Ini option asp_tags is a deprecated option since PHP 7.0.0.",  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        "file":"DeprecatedIniOptions.php",  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        "line":8  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    },  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        "type":"deprecated.option",  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        "message":"Ini option mbstring.http_input is a deprecated option since PHP 5.6.0. Use 'default_charset' instead.",  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        "file":"DeprecatedIniOptions.php",  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        "line":13  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    },  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        "type":"deprecated.option",  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        "message":"Ini option highlight.bg is a deprecated option since PHP 5.4.0.",  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        "file":"DeprecatedIniOptions.php",  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        "line":18  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    },  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        "type":"deprecated.option",  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        "message":"Ini option safe_mode is a deprecated option since PHP 5.3.0 (removed in PHP 5.4.0).",  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        "file":"DeprecatedIniOptions.php",  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        "line":23  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                ]  | 
            
            
                                                        
            
                                    
            
            
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The PSR-1: Basic Coding Standard recommends that a file should either introduce new symbols, that is classes, functions, constants or similar, or have side effects. Side effects are anything that executes logic, like for example printing output, changing ini settings or writing to a file.
The idea behind this recommendation is that merely auto-loading a class should not change the state of an application. It also promotes a cleaner style of programming and makes your code less prone to errors, because the logic is not spread out all over the place.
To learn more about the PSR-1, please see the PHP-FIG site on the PSR-1.