Question

如果可能，if语句如何在数组中添加一个数组。

示例。

import numpy as np
import matplotlib.pyplot as plt #to plot visualizations
import pandas as pd

# Importing the dataset
df = pd.read_csv(<Your-dataset-path>)
# Assigning feature and target variables
X = df.iloc[:,:-1]
y = df.iloc[:,-1]

# Use label encoders, if you have any categorical variable
from sklearn.preprocessing import LabelEncoder
labelencoder = LabelEncoder()
X['<column-name>'] = labelencoder.fit_transform(X['<column-name>'])

from sklearn.preprocessing import OneHotEncoder
onehotencoder = OneHotEncoder(categorical_features = ['<index-value>'])
X = onehotencoder.fit_transform(X).toarray()

# Avoiding the dummy variable trap
X = X[:,1:] # Usually done by the algorithm itself

#Spliting the data into test and train set
from sklearn.model_selection import train_test_split
X_train, X_test, y_train, y_test = train_test_split(X,y, random_state = 0, test_size = 0.2)

# Fitting the model
from sklearn.linear_model import LinearRegression
regressor = LinearRegression()
regressor.fit(X_train, y_train)

# Predicting the test set results
y_pred = regressor.predict(X_test)

我收到未预期的'if'（T_IF）分析错误，期望为'）'

Answer 1

尝试一下。这会起作用。

$a = 1;
$x = 1;
$array = [];
$array[] = array(
    'name' => 'name',
    'type' => 'type',
    'label' => 'label',
);
if( $a == $x ){
  $array[] =  array(
      'name' => 'name',
      'type' => 'type',
      'label' => 'label',
  );
}
$array[] =  array(
  'name' => 'name',
  'type' => 'type',
  'label' => 'label',
);

输出：

Array
(
    [0] => Array
        (
            [name] => name
            [type] => type
            [label] => label
        )

    [1] => Array
        (
            [name] => name
            [type] => type
            [label] => label
        )

    [2] => Array
        (
            [name] => name
            [type] => type
            [label] => label
        )

)

Answer 2

希望得到帮助：

$a = 1;
$x = 1;

$array = array(
    array(
        'name' => 'name',
        'type' => 'type',
        'label' => 'label',
    ),

    array(
      'name' => 'name',
      'type' => 'type',
      'label' => 'label',
    ),
);

if ( $a === $x ) {

    $array[] = array(
        'name' => 'name',
        'type' => 'type',
        'label' => 'label',
    );
}

print_r($array);

如果语句在数组内创建数组

2 个答案: