Essential Books

Session name

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Checking if session cookies have been created

Session name is the name of the cookie used to store sessions. You can use this to detect if cookies for a session have been created for the user: 

if(isset($_COOKIE[session_name()])) {
    session_start();
}

Note that this method is generally not useful unless you really don’t want to create cookies unnecessarily.

Changing session name

You can update the session name by calling session_name(). 

//Set the session name
session_name('newname');
//Start the session
session_start();

If no argument is provided into session_name() then the current session name is returned.

It should contain only alphanumeric characters; it should be short and descriptive (i.e. for users with enabled cookie warnings). The session name can’t consist of digits only, at least one letter must be present. Otherwise a new session id is generated every time.
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Sessions:
* Sessions
* session start Options
* Session Locking
* Manipulating session data
* Destroy an entire session
* Session name
* Safe Session Start With no Errors
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0 Getting started
1 Variables
2 Arrays
3 Functional programming
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5 Autoloading primer
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39 Contributing to PHP Manual
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57 Installing PHP on Windows
58 DateTime class
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62 Installing on Linux / Unix
63 Contributing to PHP Core
64 Coding conventions
65 Using MongoDB
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67 Using SQLSRV
68 Unicode Support
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75 SOAP Server
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84 Outputting the value of a variable
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87 MongoDB
88 Manipulating an array
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90 Processing multiple arrays together
91 SPL data structures
92 Comments
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97 HTTP Authentication
98 Recipies
99 BC Math Binary Calculator
100 Docker deployment
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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