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Introduction
A simple tutorial
Language Reference
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Predefined Variables
Predefined Exceptions
Predefined Interfaces and Classes
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Security
Introduction
General considerations
Installed as CGI binary
Installed as an Apache module
Session Security
Filesystem Security
Database Security
Error Reporting
User Submitted Data
Hiding PHP
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Features
HTTP authentication with PHP
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Sessions
Dealing with XForms
Handling file uploads
Using remote files
Connection handling
Persistent Database Connections
Command line usage
Garbage Collection
DTrace Dynamic Tracing
Function Reference
Affecting PHP's Behaviour
Audio Formats Manipulation
Authentication Services
Command Line Specific Extensions
Compression and Archive Extensions
Cryptography Extensions
Database Extensions
Date and Time Related Extensions
File System Related Extensions
Human Language and Character Encoding Support
Image Processing and Generation
Mail Related Extensions
Mathematical Extensions
Non-Text MIME Output
Process Control Extensions
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PHP Function List
immutable
doesn't exist. Closest matches:
datetimeimmutable
date_create_immutable_from_format
date_create_immutable
is_countable
countable
is_executable
is_writable
is_iterable
is_writeable
is_double
throwable
intval
stringable
imagescale
db2_tables
imap_close
gc_disable
imagerectangle
pg_field_table
imap_base64
imagegd
imap_setacl
imap_alerts
curlmultihandle
imap_getacl
imap_delete
gdimage
imagerotate
traversable
collectable
