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In PHP, here documents are referred to as heredocs. In PHP heredocs are not string literals. Heredoc text behaves just like a double-quoted string, but without the double quotes. For example, meaning `$` will be parsed as a variable start, and `${` or `{$` as a complex variable start.
Unlike function and class names, variable names are case-sensitive. Both double-quoted ("") and heredoc strings provide the ability to interpolate a variable's value into the string. [220] PHP treats newlines as whitespace in the manner of a free-form language, and statements are terminated by a semicolon. [221]
If limit is given, after limit – 1 separators have been read, the rest of the string is made into the last substring, regardless of whether it has any separators in it. The Scheme and Erlang implementations are similar but differ in several ways. JavaScript differs also in that it cuts, it does not put the rest of the string into the last ...
Major DBMSs, including SQLite, [5] MySQL, [6] Oracle, [7] IBM Db2, [8] Microsoft SQL Server [9] and PostgreSQL [10] support prepared statements. Prepared statements are normally executed through a non-SQL binary protocol for efficiency and protection from SQL injection, but with some DBMSs such as MySQL prepared statements are also available using a SQL syntax for debugging purposes.
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String interpolation is an alternative to building string via concatenation, which requires repeat quoting and unquoting; [2] or substituting into a printf format string, where the variable is far from where it is used. Compare:
In the PHP language, which was largely inspired by Perl, "$" precedes any variable name. Names not prefixed by this are considered constants, functions or class names (or interface or trait names, which share the same namespace as classes). PILOT uses "$" for buffers (string variables), "#" for integer variables, and "*" for program labels.
Comments in PHP can be either curly brace style (both line and block), or line delimited with #l. Blocks cannot be nested. Starting in PHP 8, a # only means comment if it's not immediately followed by [. Otherwise, it delimits an attribute, which continues till the next ]. For example: