PHP ldap_connect() Function: Usage and Examples

Creates an LDAP connection handle from a host URI. This guide demonstrates its use in PHP code and explains when the result or side effect needs extra checks.

What It Does

Creates an LDAP connection handle from a host URI.

Syntax and Parameters

The examples below show a real call to ldap_connect with suitable arguments. Read the function call in context: its connection, handle, input data or other prerequisites are created before use.

Requirements: LDAP extension; an LDAPS directory and scoped credentials.

These examples are for an isolated development environment. Hostnames, credentials and remote paths must be replaced with your approved configuration.

Example 1: Core Behavior

Bind to a controlled directory and use a restricted service identity.

<?php
$ldap = ldap_connect('ldaps://directory.internal.test:636');
$resultValue = ldap_connect('ldaps://directory.internal.test:636');
echo is_bool($resultValue) ? ($resultValue ? "true" : "false") : json_encode($resultValue, JSON_PARTIAL_OUTPUT_ON_ERROR);

Observe the returned value or changed resource state. A successful function call can still require additional checks before a higher-level operation is considered successful.

Example 2: Alternative or Failure Case

The second example uses a different directory record or input value.

<?php
$ldap = ldap_connect('ldaps://directory.internal.test:636');
ldap_set_option($ldap, LDAP_OPT_NETWORK_TIMEOUT, 5);
$resultValue = ldap_connect('ldaps://directory.internal.test:636');
echo is_bool($resultValue) ? ($resultValue ? "true" : "false") : json_encode($resultValue, JSON_PARTIAL_OUTPUT_ON_ERROR);

Compare the different inputs, environment assumptions or result checks. Do not use a transport-level success value as proof that all business-level requirements were met.

Practical Example: Applying the Rule

Check permissions, server controls and returned result types before modifying live directory data.

<?php
$ldap = ldap_connect('ldaps://directory.internal.test:636');
ldap_set_option($ldap, LDAP_OPT_NETWORK_TIMEOUT, 6);
$resultValue = ldap_connect('ldaps://directory.internal.test:636');
echo is_bool($resultValue) ? ($resultValue ? "true" : "false") : json_encode($resultValue, JSON_PARTIAL_OUTPUT_ON_ERROR);

In an application, convert low-level failures into controlled responses and log only non-sensitive diagnostic context.

Important Behavior and Edge Cases

The connection and authentication are not complete until options and ldap_bind are used.

LDAP filter values and DN values require different escaping flags. Never concatenate unchecked user input into a directory query.

Comparison with Related Functions or Patterns

Common Beginner Mistakes

Key Takeaways

• Creates an LDAP connection handle from a host URI.
• The connection and authentication are not complete until options and ldap_bind are used.
• ldap_bind authenticates an LDAP connection.

Select this API or pattern based on its documented behavior and the trust boundaries in your own application, and test all external integrations against their actual deployments.