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Read a file called populations.txt and populate a php associative array with the values read from...

Read a file called populations.txt and populate a php associative array with the values read from the file.
Here is an example populations.txt file:
Dhaka, 23 million
Bangaluru, 21 million
New York, 9 million
Emporia, 23 thousand
Here's some pseudo code:
open the file
loop through the lines in the file
read a line into a string variable
explode (or is it split, or something else) the string into key value pairs
save the key value pair into your associative array
print a table header
loop through the keys of your associative array
print each key value pair


Then move the file and write to another file and read that file in the reverse order Using sprintf
like this

23 million, Dhaka
21 million, Bangaluru
9 million , New York

Using sprintf

engineering   Computer-Science   
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Homework Answers

Answer #1

Answer:

INPUT File:

populations.txt

Dhaka, 23 million

Bangaluru, 21 million

New York, 9 million

Emporia, 23 thousand

CODE: population.php

<html>
<head>
<style>
table
{
border-style:solid;
border-width:1px;
border-color:blue;
}
</style>
</head>
<body bgcolor="#EEFDEF">
<?php
$filename = 'populations.txt';
$contents = file($filename);

$data =array();
foreach($contents as $line) {
$data[explode(",",$line)[0]]=explode(",",$line)[1];
}

echo "<table border='1'><tr><th>Key</th><th>Value</th></tr>";
foreach($data as $x => $x_value) {
echo "<tr><td>" . $x . "</td><td>" . $x_value."</td></tr>";
}
echo "</table>";

echo "</br></br>Reading on Reverse Using sprintf</br>";
foreach($data as $x => $x_value) {
$txt = sprintf("%s, %s.",$x_value,$x);
echo $txt."</br>";
}
?>
</body>
</html>

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