PHP Programming Tips

INDEX
PHP - add item to beginning of associative array
PHP sizeof() Function
Split multiple lines and input them in separate row in a database
How to print a debug log
PHP prepend leading zero before single digit number
Show a number to 2 decimal places
Comparing Dates in PHP
Adding days to Date in PHP

PHP - add item to beginning of associative array

How can I add an item to the beginning of an associative array? 

For example, say I have an array like this:

$arr = array('key1' => 'value1', 'key2' => 'value2');

Answers:

You could use the union operator:

$arr1 = array('key0' => 'value0') + $arr1;

One way is with array_merge:

<?php
$arr = array('key1' => 'value1', 'key2' => 'value2');
$arr = array_merge(array('key0' => 'value0'), $arr);  ?>

PHP sizeof() Function

The sizeof() function returns the number of elements in an array.

<?php
$cars=array("Volvo","BMW","Toyota");
echo sizeof($cars);
?>

Example

for($i=0;$i<sizeof($batch);$i++){                    
   echo '<td>'. $batch[$i]['batch_name'].'</td>';
}

Split multiple lines and input them in separate row in a database

How to explode a multi-line string?

PHP explode() Function

Definition and Usage

The explode() function breaks a string into an array.

Syntax

explode(separator,string,limit)

Depending on your os a newline can be "\n", "\r\n" or "\r".

Give this a shot:

$strip=explode("<br>", nl2br($linkfield));

or maybe safer:

$strip=explode("\n", str_replace(array("\n", "\r\n"), "\n", $linkfield));

$address=explode("\n", str_replace(array("\n", "\r\n"), "\n", $student->present_address));
print_r($address);

Output

 Array ( [0] => SHANEESH P [1] => OPP MUNICIPAL OFFICE [2] => MALAPPURAM [3] => KERALA [4] => INDIA )

<?php
$text = $_POST['userlist'];
$array = explode('\n', $text);
?>

How to print a debug log

file_put_contents('your_log_file', 'your_content');

or

error_log ('your_content', 3, 'your_log_file');

Example 

file_put_contents('error_log', $userid);

Value stored to error_log file in your folder.

PHP prepend leading zero before single digit number

str_pad($number, 2, '0', STR_PAD_LEFT); 

Add zero to before number.

<?pph

$m=1;

$p= str_pad($m, 3, '0', STR_PAD_LEFT);

echo $p;

?>

Output : 001

show a number to 2 decimal places

You can use number_format():

return number_format((float)$number, 2, '.', '');

$padded = sprintf('%0.2f', $unpadded);

echo round(5.045, 2); 

Comparing Dates in PHP

How to compare Dates in php

<?php

$exp_date = "2017-01-10";
$todays_date = date("Y-m-d");

$today = strtotime($todays_date);
$expiration_date = strtotime($exp_date);

if ($expiration_date > $today) {
     echo "yes";
} else {
     echo "no";
}


?>

Adding days to Date in PHP

<?php

$Date = date("Y-m-d"); // "2010-09-17";

echo date('Y-m-d', strtotime($Date. ' + 1 days'));

echo '<br>';

echo date('Y-m-d', strtotime($Date. ' + 360 days'));

?>

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