Linux Ask! is a Q & A web site specific for Linux related questions. Questions are collected, answered and audited by experienced Linux users.
Check if an array is associative or sequential in PHP?
Answer:
In PHP, if you want to check if a given array variable is associative or sequential, you can use the following method:
<?php
$list = array(1, 2, 3, 4, 5);
$is_sequential = array_values($list) === $list;Multi-line string in Perl
Answer:
To assign a multi-line string to a variable in Perl, is easy with the following trick:
my $html = <<END;
<p>
This is HTML content.
</p>
END
print $html;
Change the PHP's maximum upload file size
Answer:
The default maximum upload file size in PHP is only 2MB. If you want to change it, you need to edit the php.ini
vi /etc/php.ini
Locate and set (100M in the following example)
memory_limit = 100M;
post_max_size = 100M;
upload_max_filesize = 100M;Try it with the number you need. (You might need to use a large value in post_max_size and memory_limit if you want to upload a file which is exactly 100M in size)
Also, remember to restart web server such as Apache if needed.
How can I find out my current package in Perl?
Answer:
To find the current package in your Perl script, you can try something like the following:
package Foo;
my $current_package = __PACKAGE__;
print "I am in package $current_package\n";
1;When executed:
# perl foo.pl
I am in package FooHow can I comment out a large block of Perl code?
Answer:
Perl does not support multi-line comments like C++ or Java. If you want to comment out a large block of Perl code, there is still a trick.
package Foo;
=pod
This is a multi-line comments
more...
more...
=cut
print "Hello";