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Top Forums Shell Programming and Scripting Shell quoting rules for other languages programmers Post 302717797 by DGPickett on Thursday 18th of October 2012 03:01:42 PM
Old 10-18-2012
Well, avoiding injection attacks and massive mistakes, with or without eval, often revolves around using quotes corrrectly and expecting all sorts of poorly behaved input data.

Rather than storing data in multiple variables with intelligence in the name, use the array. I read that in bash, simple arrays are actually implemented in a linked list, so adjust your performance expectation for big sets downward accordingly. If numeric keys and simple arrays are inconvenient, use the array-like hash container types that take string keys, in bash called associtive arrays. Hash (random) access scales much better. You have to go to PERL and up to get real arrays, other sorts of linked lists and trees as well as hash mapped containters.
 

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ARRAY_REPLACE(3)							 1							  ARRAY_REPLACE(3)

array_replace - Replaces elements from passed arrays into the first array

SYNOPSIS
array array_replace (array $array1, array $array2, [array $...]) DESCRIPTION
array_replace(3) replaces the values of $array1 with values having the same keys in each of the following arrays. If a key from the first array exists in the second array, its value will be replaced by the value from the second array. If the key exists in the second array, and not the first, it will be created in the first array. If a key only exists in the first array, it will be left as is. If several arrays are passed for replacement, they will be processed in order, the later arrays overwriting the previous values. array_replace(3) is not recursive : it will replace values in the first array by whatever type is in the second array. PARAMETERS
o $array1 - The array in which elements are replaced. o $array2 - The array from which elements will be extracted. o $... - More arrays from which elements will be extracted. Values from later arrays overwrite the previous values. RETURN VALUES
Returns an array, or NULL if an error occurs. EXAMPLES
Example #1 array_replace(3) example <?php $base = array("orange", "banana", "apple", "raspberry"); $replacements = array(0 => "pineapple", 4 => "cherry"); $replacements2 = array(0 => "grape"); $basket = array_replace($base, $replacements, $replacements2); print_r($basket); ?> The above example will output: Array ( [0] => grape [1] => banana [2] => apple [3] => raspberry [4] => cherry ) SEE ALSO
array_replace_recursive(3), array_merge(3). PHP Documentation Group ARRAY_REPLACE(3)
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