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i got these arrays;
$arr1=array("1","2","3","4");
$arr2=array("a","b","c","d");
$x=array(1,3,4,2,4,1,2,2,3,4,4,4,1);
I want to print $x to the screen like this:
a,c,d,b,d,a,b,b,c,d,d,d,a
While you could use a foreach loop like a primitive oaf (I'm kidding, don't hate me!), you could instead use functions that are designed for such things.
$map = array_combine($arr1,$arr2);
$result = array_map(function($i) use ($map) {return $map[$i];}, $x);
echo implode(",",$result);
Documentation: array_combine, array_map, anonymous functions, implode.
As a general rule, using built-in functions will often be faster than iterating yourself.
#Niet the Dark Absol Good answer
here is the one using foreach - using #sjagr suggested code
$arr1=array("1","2","3","4");
$arr2=array("a","b","c","d");
$x=array(1,3,4,2,4,1,2,2,3,4,4,4,1);
foreach ($x as $k) { echo $arr2[$k-1].','; }
Related
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Is there a more "functional" way to do this? Yes i know it's PHP and i'm trying to fit a square peg into a round hole. I'm trying to be more functional minded even though it's not a functional language.
$c = [];
foreach ($classes as $cl) {
$c[$cl->Id] = $cl->Name;
}
What you are doing is array_column.
Array_column can isolate a column in an array and set the key name with the third parameter.
$c= array_column($classes, 'Name', 'Id');
I would use this function:
$c = array_column($classes, 'Name', 'Id');
"Functional" way will be like this:
$result = array_reduce(
$classes,
function ($t, $cl) {
$t[$cl->Id] = $cl->Name;
return $t;
},
[]
);
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I was wondering if you could give two values to a class and then acces to the second one by POST, something like this (part of the code):
echo "<select name='selecttsk' id='selecttsk'>";
while($w = $bd->obtener_fila($tasker, 0)){
echo "<option class='opcion1' value ='".$w[1]/$w[2]."'>".$w[0]."</option>";
}
echo "</select>";
?>
and then i need to do something like this in other file
$var = $_POST[selecttsk];
but i need $w[2]
thanks
I suppose your $_POST['selecttsk'] does have the values in the following format:
"foo/bar"
You could use "explode" in PHP to get the second part (bar), for example:
$postvar = $_POST['selecttsk'];
$vars = explode("/", $postvar);
// Then
$var = $vars[1]; // Will be the $w[2] from the form
Look into: http://php.net/explode
Beware that if $w[1] or $w[2] ever contains a "/" you might get unexpected results, you could use the limit function of explode to mitigate that issue.
However - I would generally not recommend this workflow.
Why do you need to send two variables with one select?
(could you show us som example of what $w contains)
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Generally we add to an array with
$myarray[] = $myItem
but if $myItem is a massive object I don't want it to get copied, instead I want it to be assigned by reference. Something like
$myarray[] = &$myItem
but that doesn't work and instead replaces every element in $myarray with $myItem
I tried
$myarray[count($myarray)] = &$myItem
but it still replaces everything in $myarray
I am running PHP v5.5
Objects are always assigned by reference. So:
$collection = array();
$blah = new Blah();
$blah->param = "something";
$collection[] = $blah;
$blah->param = "changed";
echo $collection[0]->param; // will output "changed"
According to How to push a copy of an object into array in PHP
Objects are always passed by reference in php 5 or later.
Therefore this question isn't really a concern anymore.
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Ok as per your suggestion I updated... By default Laravel returns JSON... I have set it to return an array but I am still getting the same row duplicated using:
$limits = array();
foreach($pieces as $coverage_limit){
$limits[] = coveragelimit::index($coverage_limit);
}
return json_encode($limits);
}
You're just overwriting $limits inside that foreach() loop. Perhaps you mean something more like
foreach($pieces as $coverage_limit){
$limits[] = coveragelimit::index($coverage_limit);
^^--- array push?
}
As well, you don't "implement" JSON instead of arrays. You work with NATIVE data structures, then encode that structure into JSON. JSON's a transport format, it's not something you should ever deal with natively.
the $limits array will hold the last value what coveragelimit::index() returns over the iterate, I would suggest a check on coveragelimit::index() return value if it falls with "Marc B"'s answer.
EDIT:
foreach($pieces as $key=>$coverage_limit) {
$limits[$key] = coveragelimit::index($coverage_limit);
}
or
foreach($pieces as $coverage_limit) {
array_push($limits, coveragelimit::index($coverage_limit));
}
both should returns the same as Marc B's answer
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I am trying to get strings from a long array value.
for example
$array[1]='this is a good day. The number:1, class:math';
$array[2]='this is a bad day. The number:2, class:english';
$array[3]='this is a fine day. The number:3, class:physics';
I want to get the number:1 or class:math strings out of the array.
I tried
echo array_search('number:1',$array);
but it gave me nothing. I was wondering if there are better ways to do this. Thanks a lot!
I guess you're searching for something like the following. Searching for a needle inside of values of arrays.
<?php
function array_search_inline($needle, $haystack) {
foreach ($haystack as $key => $value) {
if (strpos($value, $needle) !== false) {
return $key;
}
}
return false;
}
?>
Note: array_search simply compares the array's values and does not search inside of them.