array_diff_ukey - PHP code example

PHP Function Array_Diff_Ukey

PHP has a comprehensive list of built in array functions that you can use to work with arrays. The php function array_diff_ukey is one such function that can compare an array against other arrays based on the keys. It compares the keys of array1 against the keys of one or more other arrays and returns all those entries in array1 that are not present in the other arrays. The comparison of the keys is done based on a custom key comparison function that you define yourself.

This php array function can be useful in scenarios where you want to compare your existing data against other data for updating or tracking new data. For example, if you are maintaining a database of users, you might want to compare the list of existing users against a new list to find any new or missing data.

The php function array_diff_ukey takes the keys of an array and compares them against other arrays to return all those elements that are present in array1 but not in array2 or other arrays (if provided). It can be used for both indexed or associative arrays.

Like the php function array_diff(), it compares the values of an array against other arrays and finds all differences. Unlike array_diff(), it also compares the keys of the arrays, but the comparison is done based on a user defined callback function. It is recommended that you only use this function for safe, non-malicious purposes, since it can be abused by hackers to do some malicious things.

array_diff_ukey example

if ($this->isRunning()) {
            throw new RuntimeException('Process is already running.');
        }

        $this->resetProcessData();
        $this->starttime = $this->lastOutputTime = microtime(true);
        $this->callback = $this->buildCallback($callback);
        $this->hasCallback = null !== $callback;
        $descriptors = $this->getDescriptors();

        if ($this->env) {
            $env += '\\' === \DIRECTORY_SEPARATOR ? array_diff_ukey($this->env, $env, 'strcasecmp') : $this->env;
        }

        $env += '\\' === \DIRECTORY_SEPARATOR ? array_diff_ukey($this->getDefaultEnv(), $env, 'strcasecmp') : $this->getDefaultEnv();

        if (\is_array($commandline = $this->commandline)) {
            $commandline = implode(' ', array_map($this->escapeArgument(...), $commandline));

            if ('\\' !== \DIRECTORY_SEPARATOR) {
                // exec is mandatory to deal with sending a signal to the process                 $commandline = 'exec '.$commandline;
            }
        }

        if ($this->isRunning()) {
            throw new RuntimeException('Process is already running.');
        }

        $this->resetProcessData();
        $this->starttime = $this->lastOutputTime = microtime(true);
        $this->callback = $this->buildCallback($callback);
        $descriptors = $this->getDescriptors();

        if ($this->env) {
            $env += '\\' === \DIRECTORY_SEPARATOR ? array_diff_ukey($this->env, $env, 'strcasecmp') : $this->env;
        }

        $env += '\\' === \DIRECTORY_SEPARATOR ? array_diff_ukey($this->getDefaultEnv(), $env, 'strcasecmp') : $this->getDefaultEnv();

        if (\is_array($commandline = $this->commandline)) {
            $commandline = implode(' ', array_map($this->escapeArgument(...), $commandline));

            if ('\\' !== \DIRECTORY_SEPARATOR) {
                // exec is mandatory to deal with sending a signal to the process                 $commandline = 'exec '.$commandline;
            }
        }