Tell me how to create a session? How to set a value in session? How to remove data from a session?

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hi i am complted my b.tech and i want to learn php is php is good for my career and i want to know the salary growth on php any one can tell the answer plz and i am learning php myself it is easy to understand..........

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When to use single quotes, double quotes, and backticks?

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What is form submission?

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Tools used for drawing er diagrams?

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How can we register the variables into a session?

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if i give Limit for mysql query through php command line script like this for ex. $limit=500; $total_items = 1500; for($start=0;$start<$total_items;){ $command = "/usr/bin/php -q /home/sitename/public_html/admin/feedmanager/test.php feedid ".$_GET['feedid']." start ".$start." end ".$limit ; $start = $start+$limit; $command_result = system($command); } so it's execute command for 3 times so it give limit to sql query but if i have 27000 data so it takes long time? so my question is that is that any way from php command line script that i can use for collect all the data at once?

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Tell me how to find the position of the first occurrence of a substring in a string?

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Differentiate between php5 and php7?

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How to avoid the undefined index error?

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How to convert strings in hex format?

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What is meant by urlencode and urldecode?

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