Five tips for using PHP

Some of the tips of PHP, the basis for comparison, summed up the old bird in a different posture floated.

1. Str_replace

Str_replace is often commonly used PHP functions, for string replacement, often see some of the new PHP to replace a batch of strings, wrote a lot of lines str_replace, it is appalling.

Like this example:

$str = ' Someone's habitat---www.ooso.net ';

$str = Str_replace (' Someone ', ' bad person ', $str);

$str = Str_replace (' ', ' di ', $str);

$str = str_replace (' Habitat ', ' pig litters ', $str);

$str = Str_replace (' www.ooso.net ', ' ooso.net ', $str);

Above, replaced 4 times string, actually just change the wording, one line is done:

$str = ' Someone's habitat---www.ooso.net ';

$str = Str_replace (' Someone ', ', ', ' habitat ', ' www.ooso.net '), Array (' villains ', ' di ', ' Pig litters ', ' ooso.net '), $STR);

2. Array

Often see someone with an array to write this:

echo $arr [Some_key];

The above line of code can run, it does not look very big problem, but if you php.ini error notice open, you will receive a large number of error. The PHP parser first takes "Some_key" as a constant, but if you do not define a constant like Some_key, the parser is very tolerant to treat it as a string. So the new students better write a complete point:

echo $arr [' Some_key '];

So there's no problem, if you're going to put it in double quotes, you can't omit the quotes, so you can write:

echo "This is a string mixed in double quotes {$arr [' Some_key ']}";

3. Type trick

Type-juggling is quite handy, such as having a form to submit a variable, normally it should be integral type, sometimes lazy omit checksum can be the way of writing:

$intVar = (int) $_post[' Post_var '];

Another example is the array, sometimes write key value to quote is not very uncomfortable ah, we can convert it to object, such as:

$arr = Array (' name ' => ' volcano ', ' sex ' => ' male ');

$arr = (object) $arr;

Echo $arr->name;

Echo $arr->sex;

Is it convenient?

4. Lambda function

Lamda functions and Array_* series functions work wonders, take an example from the PHP manual:

<?php

$av = Array ("The", "a", "that", "this");

Array_walk ($av, Create_function (' & $v, $k ', ' $v = $v. "Mango";

Print_r ($AV);

?>

At least one for loop saved

5. Nested loops to display the table's cells

Nested loops to display the cells of a table, this is a very old topic oh, it is often to be in a cell behind a condition to judge what, consider whether to output TR or TD tag.

I introduce a method, using the Array_chunk function can be more neat output of HTML, see the example below, to output a 4 rows of 6 columns table:

<?php

$arr = Range (1, 24); This will generate an array of arrays (1,2,3,4....24)

$arr = Array_chunk ($arr, 6);

Output table

?>

<table> <?php foreach ($arr as $row):?> <tr> <?php foreach ($row as $col):?> <td><?php Ech o $col?></td> <?php endforeach;? > </tr> <?php endforeach;? > </table>