PHP · Theory

Array uasort()

Theory

167/352

Array uasort()

Array uasort() is a PHP array helper. You pass an array, you get a new array or a boolean/count. Example: in_array(40, $marks), array_merge($a,$b), count($marks).

foreach is still how you loop. Functions don’t replace understanding [ ] vs ['name'=>].

Trap — expecting the original array to change when the function returns a copy (array_map).

Exam tip

Array uasort(): one array, one function call, say the result.

Example

<?php
$langs = ["PHP", "JS", "SQL"];
$langs[] = "Python";
foreach ($langs as $i => $lang) {
  echo "$i: $lang\n";
}

Array uasort() — pHP arrays are ordered maps. foreach walks key and value.

Short notes

DefArray uasort() — PHP array function.
RuleRead the return value. foreach to walk.
TrapThinking it always edits in place.

PHP · Theory

Array uasort()

← All stacks

Theory

167/352

Array uasort()

Array uasort() is a PHP array helper. You pass an array, you get a new array or a boolean/count. Example: in_array(40, $marks), array_merge($a,$b), count($marks).

foreach is still how you loop. Functions don’t replace understanding [ ] vs ['name'=>].

Trap — expecting the original array to change when the function returns a copy (array_map).

Exam tip

Array uasort(): one array, one function call, say the result.

Example

<?php
$langs = ["PHP", "JS", "SQL"];
$langs[] = "Python";
foreach ($langs as $i => $lang) {
  echo "$i: $lang\n";
}

Array uasort() — pHP arrays are ordered maps. foreach walks key and value.

Short notes

DefArray uasort() — PHP array function.
RuleRead the return value. foreach to walk.
TrapThinking it always edits in place.

Array uasort()

Example

Short notes

Questions

Array uasort()

Example

Short notes

Questions