Essential Books

Setting error reporting and where to display them

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If it’s not already done in php.ini, error reporting can be set dynamically and should be set to allow most errors to be shown:

Syntax 

int error_reporting ([ int $level ] )

Examples 

// should always be used prior to 5.4
error_reporting(E_ALL);

// -1 will show every possible error, even when new levels and constants are added 
// in future PHP versions. E_ALL does the same up to 5.4.
error_reporting(-1);

// without notices
error_reporting(E_ALL & ~E_NOTICE);

// only warnings and notices.
// for the sake of example, one shouldn't report only those
error_reporting(E_WARNING | E_NOTICE);

errors will be logged by default by php, normally in a error.log file at the same level than the running script.

in development environment, one can also show them on screen: 

ini_set('display_errors', 1);

in production however, one should 

ini_set('display_errors', 0);

and show a friendly problem message through the use of an Exception or Error handler.

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Exception handling and error reporting:
* Exception Handling and Error Reporting
* Setting error reporting and where to display them
* Logging fatal errors
* Exception and Error handling
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0 Getting started
1 Variables
2 Arrays
3 Functional programming
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5 Autoloading primer
6 Exception handling and error reporting
7 Working with dates and time
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37 Object serialization
38 PHPDoc
39 Contributing to PHP Manual
40 String parsing
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46 Type juggling and non-strict comparison issues
47 Security
48 PHP MySQLi
49 Command Line Interface CLI
50 Localization
51 Debugging
52 Superglobal variables
53 Unit testing
54 Variable scope
55 References
56 Compilation errors and warning
57 Installing PHP on Windows
58 DateTime class
59 Headers manipulation
60 Performance
61 Common Errors
62 Installing on Linux / Unix
63 Contributing to PHP Core
64 Coding conventions
65 Using MongoDB
66 Asynchronous programming
67 Using SQLSRV
68 Unicode Support
69 Functions
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71 Hot to detect client IP address
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73 Image processing with GD
74 Multiprocessing
75 SOAP Server
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80 Cryptography
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82 SQLite3
83 Sockets
84 Outputting the value of a variable
85 String formatting
86 Compile PHP extensions
87 MongoDB
88 Manipulating an array
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90 Processing multiple arrays together
91 SPL data structures
92 Comments
93 IMAP
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95 Imagick
96 SimplXML
97 HTTP Authentication
98 Recipies
99 BC Math Binary Calculator
100 Docker deployment
101 WebSockets
102 APCu
103 Design patterns
104 Secure remember me
105 PHP mysqli
106 PHP built-in server
107 How to break down an URL
108 PSR
109 Contributors