There are two types of syntax: a simple one and a complex one. There are also functions for URL strings, and functions to encrypt/decrypt strings (mcrypt and mhash). To get a starts with valid numeric data, this will be the value used. Valid numeric data is an optional sign, followed by one or more digits (optionally containing a decimal point), followed by an optional exponent.
The simple syntax is the most common and convenient. The exponent is an 'e' or ' E' followed by one or more digits.
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It has no information about how those bytes translate to characters, leaving that task to the programmer.
There are no limitations on the values the string can be composed of; in particular, bytes with value (“NUL bytes”) are allowed anywhere in the string (however, a few functions, said in this manual not to be “binary safe”, may hand off the strings to libraries that ignore data after a NUL byte.) This nature of the string type explains why there is no separate “byte” type in PHP – strings take this role.
Functions that return no textual data – for instance, arbitrary data read from a network socket – will still return strings.
is series of characters, where a character is the same as a byte. Also, the identifier must follow the same naming rules as any other label in PHP: it must contain only alphanumeric characters and underscores, and must start with a non-digit character or underscore.
This means that PHP only supports a 256-character set, and hence does not offer native Unicode support. , and there may not be any spaces or tabs before or after the semicolon.
It's also important to realize that the first character before the closing identifier must be a newline as defined by the local operating system. The closing delimiter must also be followed by a newline.
If this rule is broken and the closing identifier is not "clean", it will not be considered a closing identifier, and PHP will continue looking for one.
If a proper closing identifier is not found before the end of the current file, a parse error will result at the last line.
Heredocs can not be used for initializing class properties. // This is wrong for the same reason as $foo[bar] is wrong outside a string.// In other words, it will still work, but only because PHP first looks for a// constant named foo; an error of level E_NOTICE (undefined constant) will be// thrown. As a result, accessing or modifying a string using array brackets is not multi-byte safe, and should only be done with strings that are in a single-byte encoding such as ISO-8859-1.
Since PHP 5.3, this limitation is valid only for heredocs containing variables. This means that quotes in a heredoc do not need to be escaped, but the escape codes listed above can still be used. string(1) "b" bool(true) Warning: Illegal string offset '1.0' in /tmp/on line 7 string(1) "b" bool(false) Warning: Illegal string offset 'x' in /tmp/on line 9 string(1) "a" bool(false) string(1) "b" bool(false) manipulation.
Variables are expanded, but the same care must be taken when expressing complex variables inside a heredoc as with is specified in double quotes or with heredoc, variables are parsed within it. See the string functions section for general functions, and the regular expression functions or the Perl-compatible regular expression functions for advanced find & replace functionality. While the exact structure of this string should not be relied on and is subject to change, it will always be unique for a given resource within the lifetime of a script being executed (ie a Web request or CLI process) and won't be reused.