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Integrating Bash with PHP : Page 3

Bash scripts can simplify many OS-oriented tasks for PHP developers. Even better, you can run Bash scripts directly from PHP, passing arguments, arrays, and receiving output that you can analyze or display.




Building the Right Environment to Support AI, Machine Learning and Deep Learning

Passing Arrays between PHP and Bash

Bash provides one-dimensional array variables that you declare using the form:

Array_name=(value1 ... valuen).

You can then reference any element of an array using the syntax ${name[subscript]}. There is no maximum limit on the size of an array. For example, you can pass a set of arguments to a Bash script that groups them into arrays. The following PHP script (array.php) sends a list of integers:

<?php $result=shell_exec( "C:\bash-2.03\bash.exe array.txt 10 2 13 88 76 34"); echo($result); ?>

The arrayNumber.txt Bash script in Listing 1 extracts the arguments and creates two Bash arrays (the Bash script also provides a few basic array operations):

The code in Listing 1 stores output into an arrayNumberResult.txt file. When you run the example, the output is:

First numeric array is: 10 2 13 Second numeric array is: 88 76 34 Length of first array is: 3 Length of second array is: 3 0 ----> sum[0] = myArray1[0] + myArray2[0] *** 98 product[0] = myArray1[0] * myArray2[0] *** 880 average[0] = (myArray1[0] + myArray2[0])/2 *** 49 ------------ 1 ----> sum[1] = myArray1[1] + myArray2[1] *** 78 product[1] = myArray1[1] * myArray2[1] *** 152 average[1] = (myArray1[1] + myArray2[1])/2 *** 39 ------------ 2 ----> sum[2] = myArray1[2] + myArray2[2] *** 47 product[2] = myArray1[2] * myArray2[2] *** 442 average[2] = (myArray1[2] + myArray2[2])/2 *** 23 ------------ The sum of all elements of the first array is *** 25 ------------ The first array after deleting the second element is *** 10 13 ------------

Listing 2 contains a similar example that uses string arrays and demonstrates operations over strings (add, paste, display length, and so on). The PHP script (array.php) that runs the Bash script is:

<?php $result=shell_exec( "C:\bash-2.03\bash.exe array.txt red black white blue pink"); echo($result); ?>

When you run array.php script, the result stored in the arrayResult.txt file is:

Length of first array is 2 Length of second array is 3 ------------ red <--> white red <--> blue red <--> pink black <--> white black <--> blue black <--> pink ------------ red black aqua magenta ------------ redwhite blackblue aquapink magenta ------------

Passing True PHP Arrays

If you want to pass a PHP array to Bash instead of a list of arguments, convert the PHP array into a string and pass it as shown below (you can use any element separator you like):

<?php $nr = array("one", "two", "three", "four", "five"); $separated = implode(":", $nr); echo 'The PHP array converted in a string: <br />'; echo $separated."<br /> <br />"; $result=shell_exec("C:\bash\bash-2.03\bash.exe arrayToBash.txt '".$separated."'"); &#133;

Next, the Bash script will build an array from this string as follows:

#!/bin/bash string=$1 until [ "$token" = "$string" ] do token=${string%%:*} a[$i]=$token"BASH" string=${string#*:} ((i=i+1)) done #echo "a[0]="${a[0]} #echo "a[1]="${a[1]} #echo "a[2]="${a[2]} #echo "a[3]="${a[3]} #echo "a[4]="${a[4]} echo ${a[@]}

PHP may reconstruct the array from the Bash string using code like this:

//convert from Bash string to PHP array $pieces = explode(" ", $result); echo "<br /><br /> Convert from Bash string to PHP array: <br />"; echo "pieces[0]=".$pieces[0]." <br />"; echo "pieces[1]=".$pieces[1]." <br />"; echo "pieces[2]=".$pieces[2]." <br />"; echo "pieces[3]=".$pieces[3]." <br />"; echo "pieces[4]=".$pieces[4]." <br />"; ?>

The output is (notice that Bash script added the "BASH" text termination for every array element—this is just a flag to show that the Bash script worked):

The PHP array converted in a string: one:two:three:four:five The Bash array elements: oneBASH twoBASH threeBASH fourBASH fiveBASH Convert from Bash string to PHP array: pieces[0]=oneBASH pieces[1]=twoBASH pieces[2]=threeBASH pieces[3]=fourBASH pieces[4]=fiveBASH Passing PHP objects to Bash

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