Why does the definition of the maximum digit - max not work? - php

Question

It is necessary to check the array diff_prices (RSI, EMA and MACD), determine the highest indicator in the percentage field in the checked pairs and get all its values (symbols, future_price, spot_price, percentage).
My function:
function satisfies_rules($symbol, $closing_prices, $diff_prices) {
// Calculate the RSI and EMA values using the PECL trader extension
$rsi = trader_rsi($closing_prices, 6);
$ema16 = trader_ema($closing_prices, 16);
$ema48 = trader_ema($closing_prices, 48);
$ema200 = trader_ema($closing_prices, 200);
// Get the last values of the RSI, EMA, and MACD arrays
$rsi = end($rsi);
$ema16 = end($ema16);
$ema48 = end($ema48);
$ema200 = end($ema200);
$macd = end(array_slice(trader_macd($closing_prices, 12, 26, 9), -1)[0]);
$macd = sprintf("%f", $macd);
// Check if the symbol satisfies the rules
if ($rsi > 70) {
// If the symbol satisfies the rules, return the symbol, future_price, and spot_price
//var_dump($diff_prices[$symbol]);
return $diff_prices[$symbol];
}
}
My index code:
// Check if the PECL trader extension is available
if (function_exists('trader_macd')) {
// Initialize an array to store the symbols that satisfy the rules
$valid_symbols = array();
// Iterate over the $responses array
foreach ($responses as $symbol => $candle_data) {
// Extract the closing prices from the candle data
$closing_prices = array_column($candle_data, 4);
// Check if the symbol satisfies the rules
if ($response = satisfies_rules($symbol, $closing_prices, $diff_prices)) {
// If the symbol satisfies the rules, add it to the $valid_symbols array
$valid_symbols[$symbol] = $diff_prices[$symbol]; //var_dump($valid_symbols[$symbol]['percentage']);
var_dump($valid_symbols[$symbol]);// check
}
}
// Print the symbol, future_price, and spot_price
//var_dump($valid_symbols);
$max_symbol = array_keys($valid_symbols, max($valid_symbols))[0];
$future_price = $valid_symbols[$max_symbol]['future_price'];
$spot_price = $valid_symbols[$max_symbol]['spot_price'];
$percentage = $valid_symbols[$max_symbol]['percentage'];
echo "Symbol: $max_symbol\n";
echo "Future price: $future_price\n";
echo "Spot price: $spot_price\n";
echo "Percentage: $percentage\n";
}
As a result, I get an incorrect selection.
Symbol: ENSUSDT Future price: 11.191 Spot price: 11.22000000 Percentage: 0.25913680636225
There are higher values in var_dump Percentage
Help me fix it, please.