07-28-2008
The double quotes are mainly for safety (good habit in case $h ends up containing an empty string by mistake, for example) and in theory, the && variant could create two external processes where -a would only create one. (It's theory because [ is probably handled internally in moderns shells, so there is no external process involved.)
Shell scripts are not parsed much, the syntax is more shallow than in many other scripting languages and this creates some complications, but also helps make the shell extremely versatile. The lack of standard, built-in arithmetic operators right from the start is another source of complexity in this case. POSIX attempts to fix some of the issues but historically, different shells have developed different extensions which have then created, as it were, even more different ways to skin a cat.
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LEARN ABOUT PHP
db2_stmt_error
DB2_STMT_ERROR(3) 1 DB2_STMT_ERROR(3)
db2_stmt_error - Returns a string containing the SQLSTATE returned by an SQL statement
SYNOPSIS
string db2_stmt_error ([resource $stmt])
DESCRIPTION
Returns a string containing the SQLSTATE value returned by an SQL statement.
If you do not pass a statement resource as an argument to db2_stmt_error(3), the driver returns the SQLSTATE value associated with the
last attempt to return a statement resource, for example, from db2_prepare(3) or db2_exec(3).
To learn what the SQLSTATE value means, you can issue the following command at a DB2 Command Line Processor prompt: db2 '? $sqlstate-
value'. You can also call db2_stmt_errormsg(3) to retrieve an explicit error message and the associated SQLCODE value.
PARAMETERS
o $stmt
- A valid statement resource.
RETURN VALUES
Returns a string containing an SQLSTATE value.
SEE ALSO
db2_conn_error(3), db2_conn_errormsg(3), db2_stmt_errormsg(3).
PHP Documentation Group DB2_STMT_ERROR(3)