PHP foreach array with function names and dynamically execute them

Question

I want to call the function xxx() and execute getCdl(). In getCdl() function i want to call the method dynamically. But this gives an error Call to undefined function trader_cdl2crows. But when i execute trader_cdl2crows() directly it works.

How can achieve this? :)

Functions:

public function xxx(){
$cdls = [
    'trader_cdl2crows',
    'trader_cdl3blackcrows',
    'trader_cdl3inside',
    'trader_cdl3linestrike',
    etc,etc,etc
$result = [];
foreach ($cdls as $cdl) {
    $result[$cdl] = $this->getCdl($cdl,$ticksPerType);
}
vardump($result);
}

private function getCdl($method,$ticksPerType){
return $method(
    $ticksPerType[$this->ticks::TICK_TYPE_OPEN],
    $ticksPerType[$this->ticks::TICK_TYPE_HIGH],
    $ticksPerType[$this->ticks::TICK_TYPE_LOW],
    $ticksPerType[$this->ticks::TICK_TYPE_CLOSE]
);
}

Is trader_cdl2crows a function, or is it a method of your class? (same for others) — Jeto
– Jeto, Commented Mar 26, 2019 at 3:54
There are actually weird invisible characters in your function names, try copy pasting "trader_cdl2crows" from your sample array here. This is probably your issue (I'll post this as an answer if you can confirm it). You can even put it in your URL bar / a SO comment or any text editor and see that you can hit the arrow keys twice after between _ and c. — Jeto
– Jeto, Commented Mar 26, 2019 at 3:59

Jeto · Accepted Answer · 2019-03-26 04:16:17Z

2

Your function names, such as trader_cdl2crows, have an zero-width space character right after the _ character.

Try encoding it using this tool for instance and it will give you: trader_cdl2crows for the first function ( is that zero-width char), and similar results for the rest of them. You can also notice by attempting to use arrow keys while editing these names within any input field/text editor such as a SO comment (need two "steps" to go from _ to c and vice-versa).

So replace your array with this:

$cdls = [
  'trader_cdl2crows',
  'trader_cdl3blackcrows',
  'trader_cdl3inside',
  'trader_cdl3linestrike',
  // if you have more function names, rewrite them here
];

This looks the exact same but does not have the invisible characters in it.

edited Mar 26, 2019 at 4:16

answered Mar 26, 2019 at 4:06

Jeto

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3 Comments

Nicolas Racine Over a year ago

Wow, Good find. How did you find that ? Select->SHIFT+RIGHT?

Jeto Over a year ago

Actually I copy-pasted OP's code into IntelliJ's text editor and these characters appear as spaces there, I was wondering why the f*** IJ added those and then I figured it out :)

Bas Over a year ago

pffff, that was it... coppied the function names from here php.net/manual/en/function.trader-cdlengulfing.php and that coused the weird characters, thanks for your help! It works

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